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According to the U.S. Census Bureau, 20% of the workers in Atlanta use public transportation. Suppose...

According to the U.S. Census Bureau, 20% of the workers in Atlanta use public transportation. Suppose 25 Atlanta workers are randomly selected. (Hint: use sampling distribution)

(a) What is the standard deviation of the sample proportion of the selected workers who use public transportation?

(b) What is the probability that the proportion of the selected workers who use public transportation is less than 32%?

(c) What is the probability that the proportion of the selected workers who use public transportation is greater than 48%?

math   Statistics-And-Probability   
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