According to an almanac, 70% of adult smokers started smoking before turning 18 years old. (a) Compute the mean and standard deviation of the random variable X, the number of smokers who started before 18 in 300 trials of the probability experiment. (b) Interpret the mean. (c) Would it be unusual to observe 255 smokers who started smoking before turning 18 years old in a random sample of 300 adult smokers? Why?

Q: According to an almanac, 60% of adult smokers started smoking before turning 18 years old. (a)…

A: Given information- Sample size, n = 300 The proportion is = 0.60 So, p = 0.60, q = 1 - p = 0.40

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A: Given that, probability, p= 60% = 0.60 And sample size is n= 100 Hence X~ binomial (100,0.60)

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