Question 1198518: An increasing number of consumers believe they have to look out for themselves in the marketplace. According to a survey conducted by the Yankelovich Partners for USA WEEKEND magazine, 60% of all consumers have called an 800 or 900 telephone number for information about some product. Suppose a random sample of 20 consumers is contacted and interviewed about their buying habits.
a. What is the probability that 15 or more of these consumers have called an 800 or 900 telephone number for information about some product?
b. What is the probability that more than 20 of these consumers have called an 800 or 900 telephone number for information about some product?
c. What is the probability that fewer than 10 of these consumers have called an 800 or 900 telephone number for information about some product?
Answer by ikleyn(52798)   (Show Source):
You can put this solution on YOUR website! .
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An increasing number of consumers believe they have to look out for themselves in the marketplace.
According to a survey conducted by the Yankelovich Partners for USA WEEKEND magazine,
60% of all consumers have called an 800 or 900 telephone number for information about some product.
Suppose a random sample of 20 consumers is contacted and interviewed about their buying habits.
a. What is the probability that 15 or more of these consumers have called an 800 or 900 telephone number
for information about some product?
b. What is the probability that more than 20 of these consumers have called an 800 or 900 telephone number
for information about some product?
c. What is the probability that fewer than 10 of these consumers have called an 800 or 900 telephone number
for information about some product?
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Question (b) describes an impossible situation,
THEREFORE, you better exclude it from your list, in order for nobody could think
that the composer of this problem lost his mind.
Or re-write it in a right way.
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