QUESTION 2 The customer service department of a local utility company claims tha
ID: 3159496 • Letter: Q
Question
QUESTION 2
The customer service department of a local utility company claims that 80% complaints are resolved to the customer's satisfaction. In a random sample of 11 customers with complaints what is the probability that exactly 8 had their complaints resolved to their satisfaction? (please round your answer to 4 decimal places)
QUESTION 3
The customer service department of a local utility company claims that 89% complaints are resolved to the customer's satisfaction. In a random sample of 114 customers with complaints how many would you expect to have had their complaints resolved to their satisfaction? (please round your answer to 1 decimal place)
Explanation / Answer
QUESTION 2
The customer service department of a local utility company claims that 80% complaints are resolved to the customer's satisfaction. In a random sample of 11 customers with complaints what is the probability that exactly 8 had their complaints resolved to their satisfaction? (please round your answer to 4 decimal places)
N=11
P=0.80
P(X=x) = (nCx) px (1-p)n-x
P(X=8) = (11C8) 0.8x (1-0.8)11-8
P(X = 8) = 0.2215
QUESTION 3
The customer service department of a local utility company claims that 89% complaints are resolved to the customer's satisfaction. In a random sample of 114 customers with complaints how many would you expect to have had their complaints resolved to their satisfaction? (please round your answer to 1 decimal place)
n=114,p=0.89
Expectation = np = 101.46
=101.5 ( 1 decimal)