Question

1）Suppose the probability of a customer placing an order at a pizza place for a pepperoni pizza is 0.6, and for something else with probability 0.4. We assume if a customer calls the pizza place, he orders something, and that all incoming calls are indepen- dent. What is the probability that the pizza place will get the first pepperoni pizza order on the 4th call of the day?
2）Using the accompanying normal table, find the following probabil- ities for a standard normal distribution.
(a) P(Z>0)
(b) P(−2<Z<2)
(c) P(−1.6<Z<1.8)
3） Using the accompanying normal table, find the z-value such that
(a) P(Z>z)=0.05
(b) P(−z<Z<z)=0.99

Answer 1