Ana just told me on skype to tell you that you're right.
A study published in a consumer magazine indicated that when a husband and a wife shop for a car, the husband exerts the primary influence in the descision 70% of the time. Five couples who will be purchasing a car are selected at random. Determine the probability of:
a) In exactly two of the couples, the husband will exert the primary influence on the decision.
b) In all five couples, the husband will exert the primary influence on the decision.
I got for a).132 and for b).168 ...is this correct? I dont have an answer key to check.
I got something different for a?
a) 0.7 x 0.7 x 0.3 x 0.3 x 0.3 = 0.01323
b is correct, though.
b) 0.7^5 = 0.16807