The Intelligence Quotient (IQ) Test Scores Are Normally Distributed with a Mean

The Intelligence Quotient (IQ) test scores are normally distributed with a mean of 100 and a
Standard deviation of 15.
i. What is the probability that a person would score between 85 and 115?
ii. Given a class with 25 students, what is the probability that the class' average IQ score is between
85 and 115?

A) 0.3414, 0.0228
B) 0.6826, 0.9772
C) 0.6826, Approximately zero
D) 1.0, 0.9544