Q: math teacher loans calculators to students to take home and return the next morning before school. He recorded the number of students who borrowed calculators in each of four class periods. Calculator Loan Program
1st Period 2nd Period 3rd Period 4th Period
35 15 45 85
What is the probability that a student who borrowed a calculator is in his second period class?

A
1 in 15

B
1 in 4

C
1 in 11

D
1 in 12

The weight of an object in a particular scale is 175.2 lbs. the measured weight may vary from the actual weight by at most 0.1 lbs. what is the range of actual weights of the object

What is the relationship between all triangles that can be drawn given the same three angles

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?