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Studies show that 18% of all student at Richardson Technical College smoke. Suppose that we are...

Studies show that 18% of all student at Richardson Technical College smoke. Suppose that we are interested in the proportion of the 60 students in the lunchroom cafeteria that smokes. (2 points each) a) 21 or more will smoke? ________________________ b) Between 15 and 21 will smoke? _______________________

Math   Statistics-And-Probability   
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Answer #1

Let X denotes the number of smokers among randomly selected 60 students.

X ~ Binomial(n = 60, p = 0.18)

The probability mass function of X is

a) The probability that 21 or more will smoke

b) The probability that between 15 and 21 will smoke

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