TEST.- 1) The internet bill is practically an essential expense for those people who need
it the most. The following is a list of Maria's monthly internet bills for the past
8 months.
$110, $96, $125, $80, $100, $112, $138, $99
-What is the range?
-What is the mean monthly electric bill?
-What is the variance?
What is the standard deviation?
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If the dimensions of a rectangular prism are 5 ft x 3.5 ft x 2 ſt, what is the surface area?

Ineed i been stuck on this question since yesterday

Quick! a survey of 57 customers was taken at a bookstore regarding the types of books purchased. the survey found that 33 customers purchased mysteries, 25 purchased science fiction, 18 purchased romance novels, 12 purchased mysteries and science fiction, 9 purchased mysteries and romance novels, 6 purchased science fiction and romance novels, and 2 purchased all three types of books. a) how many of the customers surveyed purchased only mysteries? b) how many purchased mysteries and science fiction, but not romance novels? c) how many purchased mysteries or science fiction? d) how many purchased mysteries or science fiction, but not romance novels? e) how many purchased exactly two types of books?