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（1）.500

3）.The top of the histogram is parallel to the y-axis 150.

2.Cyclists: 500-50-225-75 = 150 people, because 75 people travel by other means.

So 75 150=

3.Draw the bar to 150 and you're good to go.

Answers: 1, d;

2、c；3、b；

4、d；5、d；

6、c；7、d；

8、c；I'm glad to solve the above problems for you, I hope it will help you in your studies! 】≤

6. From the figure on the right, it can be obtained: the left turn accounts for the traffic flow.

24%, going straight accounts for 40% of the traffic flow, and the right turn accounts for 36% of the traffic (1) A total of 384 vehicles turning left and going straight during this period will be 384 vehicles, then the total traffic flow in this period = 384 (24% + 40%) = 384 (

600 (units).

There are 600 40% = 600 vehicles going straight during this period) (2) vehicles turning left = 600 24% = 600 vehicles) 144 240

Therefore, with the same passage time, vehicles driving in the straight lane are more likely to be blocked: (3) when the straight time is set at 30 seconds, the vehicles going straight can basically pass through, then the passage time of each vehicle = 30 240 = seconds).

When making a left turn, seconds).

Therefore, it is more reasonable to set 18 seconds when making a left turn.

First, according to B, calculate that its complement closed search is greater than the excitation is equal to 2 or less than or equal to -1 (some symbols cannot be typed by the computer, so they are said in words).

Because the complement of a and b is the lead calendar r, draw a number line and mark b, you can get a greater than or equal to 2

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