Concept explainers
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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Elementary Statistics (13th Edition)
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