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

three-fourths of an hour

36÷48=0.75

0.75=

see explanation

step-by-step explanation:

since the sequence is geometric there is a common ratio r between consecutive terms, that is

r = 4 ÷ - 2 = - 2

r = - 8 ÷ 4 = - 2

r = 16 ÷ 8 = - 2

the next term - 13 must be incorrect as it should be - 32 for the sequence to be geometric.

the first 4 terms are therefore geometric with common ratio r = - 2