1.) Suppose X has a normal distribution with mean 80. (You don't know the standard deviation.) Then the probability that X is at least 90 is one minus the probability that X is at most 90.

Group of answer choices

A.) True

B.) False

2.) Suppose X has a binomial distribution with n = 5. (You don't know the value of p.) Then the probability that X is at most 2 is one minus the probability that X is at least 3.

Group of answer choices

A.) True

B.) False

3.) 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?

Group of answer choices

A.) 12.5

B.) 10

C.) 50

D.) None of the other choices is correct

E.) 13