Question

To determine the effect their salespersons have on purchases, a department store polled 700 shoppers regarding whether or not they made a purchase and whether or not they were pleased with the service they received. Of those who made a purchase, 151 were happy with the service and 133 were not. Of those who made no purchase, 201 were happy with the service and 215 were not. Use probability rules (when appropriate) to find the probability (p) of the event stated.

(a) A shopper was happy with the service received.
p =
(b) A shopper was unhappy with the service received.
p =

Answer 1

a) p = 352/700 = 0.5029

b) p = 348/700 = 0.4971

Explanation:

A probability is the number of desired outcomes divided by the number of total outcomes.

There are 700 shoppers.

151 + 201 = 352 were happy with the service received.

133 + 215 = 348 were not happy with the service received.

(a) A shopper was happy with the service received.

352 happy out of 700

p = 352/700 = 0.5029

(b) A shopper was unhappy with the service received.

348 unhappy out of 700

p = 348/700 = 0.4971