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Telephone Answering DevicesSeventy-eight percent of U.S.
Chapter 6, Problem 18E(choose chapter or problem)
Problem 18E
Telephone Answering DevicesSeventy-eight percent of U.S. homes have a telephone answering device. In a random sample of 250 homes, what is the probability that fewer than 50 do not have a telephone answering device?
Questions & Answers
QUESTION:
Problem 18E
Telephone Answering DevicesSeventy-eight percent of U.S. homes have a telephone answering device. In a random sample of 250 homes, what is the probability that fewer than 50 do not have a telephone answering device?
ANSWER:
Solution :
Step 1 of 1:
Our goal is:
We need to find the probability that fewer than 50.
Let n denotes the total homes is 250.
Let p denotes United States homes have a telephone is 78%.
So, p = 100%-78% = 22% or 0.22.
We need to find q value.
q = 1-p
q = 1-0.22
q = 0.78