Mr. Jenkins graded a 23-point history quiz. His class had a
mean score of 18 and a standard deviation of 2. He decided
the quiz should have been worth 100 points. To fix the
scores, he added 2 to every score and then multiplied by 4.
What are the new mean and standard deviation?

a)mean = 72; standard deviation = 8
b)mean = 80; standard deviation = 8
c)mean = 74; standard deviation = 10
d)mean = 80; standard deviation = 16