According to an almanac, 70% of adult shokers started si (a) Compute the mean and standard deviation of the random variable X, the number of smokers who started before 18 in 100 trials of the probability experiment. (b) Interpret the mean. (c) Would it be unusual to observe 90 smokers who started smoking before turning 18 years old in a random sample of 100 adult smokers? Why? (a) x = 70 ox= 4.6 (Round to the nearest tenth as needed.) (b) What is the correct interpretation of the mean? A. It is expected that in a random sample of 100 adult smokers, 70 will have started smoking before turning 18. OB. It is expected that in a random sample of 100 adult smokers, 70 will have started smoking after turning 18. OC. It is expected that in 50% of random samples of 100 adult smokers, 70 will have started smoking before turning 18 (c) Would it be unusual to observe 90 smokers who started smoking before turning 18 years old in a random sample of 100 adult smokers? OA. No, because 90 is less than μ-2o. OB. No, because 90 is greater than u + 2o. OC. No, because 90 is between μ-2o and μ+20. OD. Yes, because 90 is greater than μ + 20. OE. Yes, because 90 is between μ-20 and μ + 20. D

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