According to Leichtman Research Group, 69% of U.S. households had at least one HDTV in 2012. A
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According to Leichtman Research Group, 69% of U.S.
households had at least one HDTV in 2012. A random sample of 20 U.S. homes was selected. Use the normal approximation to the binomial distribution to answer the following:
a. Calculate the mean and standard deviation for this distribution.
b. What is the probability that 12 or more households own at least one HDTV?
c. What is the probability that exactly 16 households own at least one HDTV?
d. What is the probability that 11, 12, or 13 households own at least one HDTV?
e. What is the probability that 18 or 19 households own at least one HDTV?
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