Question

The scores on an exam were normally distributed with a mean of 84 and a standard deviation of 5. What is the probability that a randomly selected class member scored above 79? Answer as a percentage.

Answer 1

0.841 (equivalent to 84.1%

Explanation:

Chances are that your calculator has several different probability distribution functions built in. Here we need the function normal(

Typing that into a calculator, as follows, returns a decimal fraction which also represents the percentage of the time that a randomly selected class member scored above 79:

normalcdf(79, 1000, 84, 5) = 0.841 (equivalent to 84.1%)