What is the answer and how is it solved?

Write the pair of fractions as a pair of fractions with a common denominator

15 and 14.7 are 1 apart, so 15 – 14.7 must be 1.

Assume that adults have iq scores that are normally distributed with a mean of mu equals 100 and a standard deviation sigma equals 20. find the probability that a randomly selected adult has an iq between 80 and 120.assume that adults have iq scores that are normally distributed with a mean of mu equals 100 and a standard deviation sigma equals 20. find the probability that a randomly selected adult has an iq between 80 and 120.