2.

A manufacturer of game controllers is concerned that their controller may be difficult for left-handed users. They set out to find lefties to test. Suppose that about 19% of the population is left-handed. They select a sample of six customers at random in their stores. Complete parts (a) through (c) below.

b) What do you expect the sample standard deviation to be? The standard deviation would be

(Round to two decimal places as needed.)

c) If we keep picking people until we find a lefty, how long do you expect it will take?

3.

A manufacturer of game controllers is concerned that their controller may be difficult for left-handed users. They set out to find lefties to test. Suppose that about 73% of the population is right-handed. They select a sample of twelve customers at random in their stores. Complete parts a through e below.

b What is the probability that they are not all right-handed?The probability that they are not all righthanded is

(Round to three decimal places as needed.)

c) What is the probability that there are no more than 10 righties?

d) What is the probability that there are exactly 6 of each?

e) What is the probability that the majority is right-handed?