In a study investigation car speed in automobile accidents, 5000 accidents were examined and the vehicle speed at impact was recorded. Suppose the average speed at impact in the study was 42 mph with a standard deviation of 15 mph. A histogram of the data revealed that the distribution of speeds was approximately normal (symmetric bell curve).a. Approximately what percent of the vehicle speeds were less than 42 mph

Approximately 50% of the vehicle speeds were less than 42 mph

Step-by-step explanation:

The normal distribution is symmetric:

That is, 50% of the measures are below the mean and 50% of the measures are above the mean.

In this problem, we have that:

Mean = 42 mph

So

Approximately 50% of the vehicle speeds were less than 42 mph

answer: it's d

step-by-step explanation:

a

step-by-step explanation:

when a number is between two straight lines it means the absolute value.

to find absolute value you need to know how many numbers is that number away from 0.

when finding absolute value the number will always come out positive

so absolute value of -3 is 3

absolute value of 3/2 is 3/2

absolute value of -2 is 2

absolute value of 3.5 is 3.5

absolute value of -1 is 1

now put these numbers in order:

a)   |-1|, |3/2|, |-2|, |-3|, |3.5|