17.

You cannot remember your 4-digit bike-lock combination. What is the probability that you guess the combination correctly? (Enter your probability as a fraction.)

22.

Your field experience instructor wants to line up 8 cars for transportation to a grade school. Between you and your classmates, there are 28 cars available. How many different groups of 8 cars are possible? different groups

23.

The ages (in years) at inauguration of the first 44 United States presidents are given below.57, 61, 57, 57, 58, 57, 61, 54, 68, 51, 49, 64, 50, 48, 65, 52, 56, 46, 54, 49, 51, 47, 55, 55, 54, 42, 51, 56, 55, 51, 54, 51, 60, 62, 43, 55, 56, 61, 52, 69, 64, 46, 54, 47(a) Make a stem-and-leaf plot of the data. (Enter numbers from smallest to largest separated by spaces. Enter NONE for stems with no values.)

Stem	Leaf
4
5
6

(b) How many presidents were in their 40s when they were inaugurated? presidents (c) What was the age of the youngest president? yr