In a survey, 90% of the people interviewed were unaware that maintaining a healthy weight could reduce the risk of stroke. If 15 people are selected at random, find the probability that at least 9 are unaware that maintaining a proper weight could reduce the risk of stroke

In a restaurant a study found that 42% of all patrons smoked. If the seating capacity of the restaurant is 80 , find the mean number of smokers, the variance, and standard deviation.

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