1) If there are 150 values in a data set, how many classes should be created for a frequency histogram?
A. 5
B. 6
C. 7
D. 8
E. 9
2) . If x is a binomial random variable where n = 100 and p = 0.2, find the probability that x is less than or equal to 15 using the normal approximation to the binomial.