Question

The average amount that a college student spends on a textbook is $205 with a

standard deviation of $35. What is the probability that a student spends:
A. between $10 and $310?
B. between $135 and $275?
C. more than $240?

Answer 1

Explanation:

Today's calculators have statistical functions built in.

A. Here we use:

normalcdf(10,310,205,35), WHICH returns 0.999.

B. normalcdf(135,275, 205,35) = 0.954

C. normalcdf(240, 10000, 205, 35) = 0.159