GMAT Math DS Questions, GMAT Math DS Questions

Variance s 2=[(x1-x) 2+(x2-x) 2+.xn-x) 2] n is to subtract the square of the mean for each number in the group, and then divide by (n-1), where n is the number of samples in the group.

Standard deviation = arithmetic square root of variance.

Standard deviation is the most commonly used quantitative form to reflect the dispersion of a set of data, and it is the most important indicator to express precision.

If each number is added to the or, the same value will be removed.

The variance is unchanged. Only if each value is multiplied or punished by a certain number.

Then the standard deviation of the new series is also multiplied by or divided by this value.

For example, suppose that in mathematics the statistics are 2 times larger for each data.

The mean is expanded by a factor of 2, the variance is by a factor of 4, and the standard deviation is by a factor of 2.

Therefore, choosing a and a for this question is sufficient to get the standard deviation.

Got it.

Data sufficiency not only requires candidates to have basic mathematical knowledge and proficient computing skills, but also pays more attention to testing candidates' ability to analyze quantitative problems, that is, according to the given data, identify which data are relevant to the problem, and determine under what circumstances the given data can meet the requirements of the problem, so as to test the candidate's ability to reason and comprehensively analyze. When doing the data filling questions, candidates should pay attention to the following:

1 There is no need for precise numerical answers, as long as the answers are found based on the data given.

2 Even if you find that data (1) is sufficient to answer the question, do not rush to choose A, but continue to review the question to see if the data can be solved alone. If data (2) can also be solved, D should be chosen.

3 Test takers should be familiar with certain essential knowledge of daily life. For example, if a question mentions a leap year, we should think that there are only 28 days in February in leap years, and we should take this data into account in the original question, and not ignore it because data (1) and (2) do not mention it.

4 When it comes to geometric figures, do not rely on the figures given on the test paper to draw wrong assumptions and judgments. Sometimes it doesn't seem graphically all drawn to scale.

Before choosing an answer, start by asking the following three questions:

Question 1: Can the first note solve the problem alone?

Question 2: Can the second note solve the problem alone?

Question 3: Can two descriptions be put together to solve the problem?

Hello tadpole I have just abused the GMAT, and for this kind of DS question, I am thinking about whether 1 and 2 are able to answer the questions asked above, rather than the answer itself "yes" or "no". It's a bit abstract so to use your example: the question for this question is "whether to produce more than 5000 pieces".

So, whether it can produce 5000 or not, 1 and 2 can give a clear answer. So it's d. There is a similar question, and there is a typical "Is the answer x??"

This kind of "yes or no" question. This kind of thing is that you clearly calculate that it is not x, but because it is not x, you can answer this "no?""so to pick on. There are also questions such as "is x>3?".

This category. If you calculate x>5, you can answer, if you calculate x>2, you can't, and if you calculate x<-5, you can answer. This kind of question is just a matter of thinking about it, especially if you give your specific value in the question, (is x=5?).

The one who chooses e is generally what's the value of ..For example, in this question, if you ask how many products, you can't calculate it with 1 or 2 alone, but if you can come out with the simultaneous equation 1+2, you can choose cIf Lianli can't come out, such as producing three kinds of balls, choose E.

Let x=small y=large.

The conditions are: 1) Spend 500=

2) Total sale price 1200=1x+ The question is:

x+y>5000

So you should choose D

Analysis: Because x, y>=0, so set x=0 and y=0 respectively to obtain the value of x+y, which is compared with 5000.

Reason for choosing D:

1) and 2) In both cases, x+y cannot be greater than 5000

Reasons for choosing E:

It's smaller than 5000 when it's only 1) and it's smaller than 5000 when it's only 2). And when 1) and 2) are satisfied at the same time, it is bigger than 5000!

Depending on the topic, choose D

Because 1c=So the maximum and minimum temperature difference between Celsius is: 45

Fahrenheit and Celsius have a graduation value of 5 9, except for the difference of 32°F from zero, i.e., 5°C is equivalent to 9°F Fahrenheit. Therefore, if only the difference in temperature is calculated, you can ignore the difference in its zero position and only consider the temperature difference, which is equivalent to Wendy 45°F Fahrenheit.

45°f×5/9=25°c

Therefore, C should be chosen.

The quantitative relationship between c and f is c 5 9 f constant term, it is meaningless to calculate the temperature difference constant term, f is 45 degrees, c is 5 9 45 degrees 25 degrees,

Move the 9 on the left to the right of the equal sign, i.e., c=5(f-32) 9, then set the maximum Fahrenheit temperature as f and the minimum as f-45, and substitute it for c=5(f-32) 9.

There are two types of questions in the exam, one is PS, which is actually Problem

The abbreviation of solving, which translates to:

Problem solving. The type of question, that is, to give a question and find the correct answer, generally requires accurate calculations, but in view of the two-minute answering time for each question in the GMAT math test, the so-called accuracy does not mean how much calculation is required, this requires skills, and it can.

9c=5(f-32) is obviously a straight line equation that can be formed.

c =5 9*f - 5*32 9 is more intuitive.

The slope is 5 9

So the difference of the independent variable is 45, then the difference of the dependent variable c is 45* slope = 45*5 9 = 25

It can also be deduced as follows:

9c1=5(f1-32) .1

9c2=5(f2-32)..2

1-2 Available.

9(c1-c2)=5(f1-f2)

c1-c2 = 5/9*(f1-f2)

c1-c2 = 5/9*45 = 25

October 21, 2021 As we all know, math is the most important part of the GMAT test that everyone needs to practice regularly, and this has been experienced in our previous exams. GMAT math is not difficult, but it also tests everyone's mastery of basic knowledge, so there are many more.

The shape of an ice cream parlor's brand is shown in the picture, which consists of a circle of 3 4 with a radius of 2 feet placed on an isosceles triangle with a height of 5 feet. Q: How many feet is the circumference of the brand?

This problem is not difficult, the circumference of the arc is 3 4 (, the waist length of a triangle is l= (5 +2).

The perimeter can be found.

Conceptual analysis of GMAT mathematics.

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New Oriental**GMAT channel brings you the concept analysis of GMAT mathematics, hoping to help you prepare for GMAT exam. For more exciting, please pay attention to the New Oriental **GMAT channel!

Prime number.

consecutive number.

consecutive even(odd) integer

cross multiply.

coefficient coefficient.

complete quadratic equation.

complementary function.

constant constant.

coordinate system coordinate system.

decimal decimals.

decimal point.

If the radius r is 2 feet, the circumference of the circle c 2 2 4 feet is 3 4 feet because the trademark pattern only takes 3 4 of the circumference, so it is 3 4 4 3 feet.

Note that the circumference of 1 4 corresponds to the circumference of 90°, so this string and the radius of the two endpoints form an isosceles right triangle, so the length of this string is 2 times the radius, which is equal to 2 2 feet, and this chord is still the bottom edge of the isosceles triangle with a height of 5 feet, then its half and height and a waist form a right triangle, and the waist is hypotenuse, which is equal to the square root of the sum of the squares of the two right angles, that is, (5 (2) )3 3, so the circumference of this trademark pattern is 3 4 circumference plus two waist lengths, that is, 3 6 3 feet, answer [b].

The circumference of the arc part is 3 4*2*2 = 3

The circumference of the missing arc in the lower part is 1 4 of the circle, and the corresponding central angle of the circle is 90°, according to the nature of the isosceles right triangle, the base edge of the isosceles triangle with a height of 5 feet 2 2, it is not difficult to deduce from the Pythagorean theorem that the waist length is 3 3

The circumference of the brand is 3 +6 3, b is the answer

Compared to the other components of the GMAT, mathematics can be called a relatively simple subject. However, it is not particularly easy to get a perfect score in this subject.

The circumference of the circle 2r = 4 , 3 4 The circle is 3 ;

The isosceles triangle below is easy to see, and one side is long》5, so choose B

The most basic Pythagorean theorem and the formula for the circumference of a circle. See the figure below for details

Pick A, this question is somewhat confusing.

Choose B, and you won't choose B when you are a student

It's a tough question, I won't.

b, the above is 3 factions. The following uses the Pythagorean understanding to choose B

GMAT Mathematics is one of the three major subjects of GMAT, and the Quantitative part of GMAT includes 37 multiple-choice questions about data sufficiency and problem solving. Let's take a look at GMAT math examples!

A coin, the probability of investing in a heads-up is not, ask how much?

1) Heads up is the probability of heads down. Twice;

2) The probability of throwing twice in a row, one up and one down, is 4 9;

Answer] A [Idea] Let the probability of facing up be x, then the probability of facing down is 1-x; (1)x=2(1-x)==x=2/3

2)c(2 1)*x*(1-x)=4/9==>x=1/3 or 2/3

4s, 6j pick 3 of them, at least 1 s, how many ways do we pick?

Answer] 100

Idea] There is at least 1 s, as long as you subtract one s from the total number, there is none. c(10 3)-c(6 3)

x^3>y

1) Root number x > y

2)x > y

Answer] E [Thinking] Take a counterexample: (1) x=1 4 y=1 3 and x=4 y=1

2)x=2 y=1 and x=-2 y=-3

1)+(2)：x=4 y=1 and x=1/4 y=1/7

The 1 8 1 7 part of an object mass is on the surface of the water, asking what is the range above water than under water?

Answer] 1 7—1 6

Idea] If the above part is 1 8, then the underwater part is 7 8, and the ratio is 1 7; If the above part is 1 7, then the underwater part is 6 7, and the ratio is 1 6. So the range is 1 7 – 1 6

x 3-x = x-a) (x-b) (x-c), and a>b>c, ask b= ?

Answer] 0 [Idea] x 3-x=(x-1)x(x+1)=(x-a)(x-b)(x-c), and a>b>c

then 1>0>-1. So b=0

These are the GMAT math practice questions, and candidates can prepare for GMAT math with the exercises in this article.

I'll translate the title for you first: If W's ** duration is calculated in the nearest integer minute, then how many minutes did W spend money on? 1.

The total cost of arguing is 2The money in the first minute is more than the next few minutes (the next few minutes are all x, the first minute is x+.)

In this way, after you understand the problem, it is obvious that 1 alone cannot be established, and 2 alone cannot be established.

If 1 and 2 are closed together, then nx+ can not be pushed out for nx+ because there are two unknowns.

So choose e and see if the answer is true.