1. One component of college expenses is your book costs. A sample of students indicates that the average book cost for a semester is 260 dollars and the standard deviation is 50 dollars. If nothing is known about the shape of the book cost distribution, what proportion of the students would have book costs between 60 dollars and 460 dollars?

2. Suppose X is a random variable best described by a uniform probability distribution with c=10and d=50. Find P(X=30)

3.The output below displays the mean and median for the high school dropout rate (in percentage) among 13 Canadian provinces/territories in Grade9 and in Grade12.

	Grade 9	Grade 12
Mean	25.11	26.18
Median	29.86	29.10

Interpret the Grade 12 median dropout rate of 29.1.