q20 Suppose X is binomial. If p = .8, how big does n have to be in order to use the normal approximation to answer a probability question?

12.5

None of the other choices is correct

13

10

50

q21 Suppose Bob rolls a fair die 100 times and X = number of 1's he gets. What is the variance of X?

None of the other choices is correct

Not enough information to answer

3.73

16.67

13.89