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Probability, variance, standard deviation

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Fifty percent of Americans believed the country was in a recession, even though technically had not shown two straight quarters of negative growth (Business Week, July 30, 2001). For a sample of 20 Americans, make the following calculations.

a. Determine the probability that exactly 12 people believed the country was in a recession.
b. Determine the probability that no more than five people believed the country was in a recession.
c. How many people would you expect to say the country was in a recession.
d. Determine the variance and standard deviation of the number of people who believed the country was in a recession.

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This shows how to determine probability, expected number, variance, and standard deviation regarding public opinion.

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Fifty percent of Americans believed the country was in a recession, even though technically had not shown two straight quarters of negative growth (Business Week, July 30, 2001). For a sample of 20 Americans, make the following calculations.
a. Determine the probability that exactly 12 people believed the country was in a recession.
b. Determine the probability that no more than five people believed the country was in a recession.
c. How many people would you expect to say ...

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