Washing Hands Based on results from a Bradley Corporation poll, assume that 70% of adults always wash their hands after using a public restroom. a. Find the probability that among 8 randomly selected adults, exactly 5 always wash their hands after using a public restroom. b. Find the probability that among 8 randomly selected adults, at least 7 always wash their hands after using a public restroom. c. For groups of 8 randomly selected adults, find the mean and standard deviation of the numbers in the groups who always wash their hands after using a public restroom. d. If 8 adults are randomly selected and it is found that exactly 1 of them washes hands after using a public restroom, is that a significantly low number?

Question

Washing Hands Based on results from a Bradley Corporation poll, assume that 70% of adults always wash their hands after using a public restroom.

a. Find the probability that among 8 randomly selected adults, exactly 5 always wash their hands after using a public restroom.

b. Find the probability that among 8 randomly selected adults, at least 7 always wash their hands after using a public restroom.

c. For groups of 8 randomly selected adults, find the mean and standard deviation of the numbers in the groups who always wash their hands after using a public restroom.

d. If 8 adults are randomly selected and it is found that exactly 1 of them washes hands after using a public restroom, is that a significantly low number?

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