A sample of 100 cars driving on a freeway during a morning commute was drawn, and the number of occupants in each car was recorded. The results were as follows:

a. Find the sample mean number of occupants.

b. Find the sample standard deviation of the number of occupants.

c. Find the sample median number of occupants.

d. Compute the first and third quartiles of the number of occupants.

e. What proportion of cars had more than the mean number of occupants?

f. For what proportion of cars was the number of occupants more than one standard deviation greater than the mean?

g. For what proportion of cars was the number of occupants within one standard deviation of the mean?

Transcribed Image Text:

Occupants 1 2 3 4 5 Number of Cars 70 15 10 3 2