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Big Box Store (BBS) has an annual rate of 4% of all sales being returned. In...

Big Box Store (BBS) has an annual rate of 4% of all sales being returned. In a recent sample of thirty randomly selected sales the number of returns was five.(Use binomial probability)

How many returns are expected in a random sample of 30 sales? What is the standard deviation for this sample?
What is the probability that a random sample of 30 sales has 5 returns?
What is the probability that a random sample of 30 sales has at least 5 returns?
What is the probability that a random sample of 30 sales has 5 or fewer returns?

math   Statistics-And-Probability   
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