Alarge college statistics class has 400 students. the students' final exam scores in the class are normally distributed with a mean of 80 and a standard deviation of 6. what is the highest score that the top 60 students in the class exceeded?

a. 81
b. 83
c. 86
d. 90
e. 95

Ben bowled 124 and 188 in his first two games. what must he bowl in his third game to have an average of at least 160?

Dexter read 11 science fiction books and 5 history books. lena read 9 science fiction books and 4 history books. compare the students’ ratios of science fiction books to history books. 1. determine the ratios’ form:    science fiction books to history books 2. write the ratios as fractions:    dexter: 115; lena: 94 3. rewrite with a common denominator. 4. compare. 5. answer the question. determine which shows the correct comparison of the ratios for this problem.

The sum of the speeds of two trains is 720.2 mph. if the speed of the first train is 7.8 mph faster than the second train, find the speeds of each.