The most basic statistical questions, but they are very error prone. I don t know how to do it, so p

Understanding 1: A mouse, the probabilities of turning left and right are respectively.

16 mice, any n mice turn right, 16-n turn left, the probability is ( = (. And the probability of selecting n out of 16 is c[16, n].

Therefore, the probability of 8 of the 16 mice making right turns is c[16, n]· (

Comprehension 2: Each mouse has two possibilities of turning left and right, and the state of 16 mice has a total of 2 16 possibilities.

There is a possibility of c[16, n] turning right in n mice, and the probability is c[16, n] 2 16

According to the first understanding:

c[16, 8]·(

c[16, 0] +c[16, 1] +c[16, 2] +c[16, 3] +c[16, 4] +c[16, 5] +c[16, 6] +c[16, 7] +c[16, 8])·

and 2 equivalent. c[16, 3] +c[16, 4] +c[16, 5] +c[16, 6] +c[16, 7] +c[16, 8] +c[16, 9])·

c[16, 10]·(

In fact.. The landlord can think about it first.。。 There are a couple of possibilities -- from 0 to 16 mice to the right -- yes, that's 17 possibilities.

So. Question 1 17

Question II 9 17

Question III 9 17

Question 4 6 17

Question 5 1 17

If you mark a mouse with a number 1 or 16, then it's his right, if all the rats are the same. It's mine.

If each mouse has its own probability of turning left or right, and each mouse's choice is independent of each other, the first position should be right.

1: Mean = , Standard Deviation =

2: Skewness coefficient = , kurtosis coefficient =

Web Links. The questions here are the same as your questions for a year old or trillion, and you can view this process and the answers for the next group.

1. The cost of a single book should have increased, 112% 108%=,, the result of my calculation of this question is like this, and the answer you provided is not the same number.

2. Price index 1 Price index 1

(1) Annual average development level (chronological average) = (200 + 220 + 235 + 252 + 266) 5 = 10,000 tons).

Average annual growth = (266-200) (5-1) = 10,000 tons) (2) average annual growth rate = ((266 200) (1 4)-1) * 100% = (Formula description: divide the level of the reporting period by the level of the base period, and then open to the 4th power (that is, the average development rate), and then subtract 1, multiply 100% to get the average growth rate).

Year-on-year growth rate: 2002: 10%; 2003：；2004：；2005：。

So the years that exceeded the average growth rate were: 2002.

3) 2007 output: = (1 + 10,000 tons).

5,b A one-off survey is a survey conducted at intervals of time.

7,b Definitions.

9,c The unit of a whole can only be an objective thing.

10,a Definitions.

11,a13,c Per capita income, population density, life expectancy.

14,b15,b quality indicators are statistical indicators that reflect the relative level or average level of socio-economic phenomena, expressed as averages or relative numbers.

I'm a statistician

Question 4a Question 6 is question 9.

(1) Achievement: Number of employees, frequency

Below 60 points 3

Total 40 100

2) The grouping flag is:"Grades", which is of type"Quantity flags"；The grouping method is as follows: open group spacing grouping in variable grouping, and the group limit is expressed as overlapping group limit;

3) The distribution of the assessment results of the employees of the unit is small at both ends and large in the middle"Normal distribution"It shows that most of the employees have mastered the business knowledge to meet the requirements of the unit.

You verify it.

1.A workshop flat.

The average salary is (120*3+100*5+85*15+70*8+60*2) 33=about=85

The average salary DAO between car B is (130*1+115*2+95*8+80*15+60*7) 33=86

The average salary in workshop A is more inward.

Representative, because this salary is the largest number of people.

2.(1) Period-by-period growth.

20 30 40 10 70 The total amount is 20 + 30 + 40 + 10 + 70 = 170

2) Month-on-month growth rate.

The development rate of the fixed base is 270 250 = 27 25 300 250 = 6 5 340 250 = 34 25 350 250 = 7 5 420 250 = 42 25

3) Month-on-month growth rate.

Fixed-base growth rate.

The 99% confidence level corresponds to a z-value of;

The square of n= is multiplied by the square divided by the error 1=

A sample of 124 should be taken.