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a. A marketing survey of 2000 randomly-selected convenience store customers foun

ID: 3174125 • Letter: A

Question

a. A marketing survey of 2000 randomly-selected convenience store customers found that 1415 of them bought a glazed donut yesterday. 1605 said they bought a frosted crème-filled donut yesterday. 180 customers said they bought neither yesterday.

• What is the probability that a single randomly-selected customer bought both a glazed donut and a frosted crème-filled donut yesterday

B. Let G = Customers who bought a glazed donut yesterday and C = customers who bought a frosted creme filled donut yesterday Determine the number of attendees belonging to each of the regions I, II, III, IV.   Please type clearly so I can understand the answer. Thank you.

Explanation / Answer

Result:

a. A marketing survey of 2000 randomly-selected convenience store customers found that 1415 of them bought a glazed donut yesterday. 1605 said they bought a frosted crème-filled donut yesterday. 180 customers said they bought neither yesterday.

• What is the probability that a single randomly-selected customer bought both a glazed donut and a frosted crème-filled donut yesterday

B. Let G = Customers who bought a glazed donut yesterday and C = customers who bought a frosted creme filled donut yesterday Determine the number of attendees belonging to each of the regions I, II, III, IV.   Please type clearly so I can understand the answer. Thank you.

180 customers said they bought neither yesterday

2000-180 = 1820 customers said they bought yesterday

Number of Customers who bought a glazed donut =1415

Number of Customers who bought a frosted crème-filled donut =1605

customer bought both a glazed donut and a frosted crème-filled donut yesterday

= (1415+1605)-1820

=1200

probability that a single randomly-selected customer bought both a glazed donut and a frosted crème-filled donut yesterday

=1200/2000

=0.6

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