According to an​ almanac, 80​% 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?         Question content area bottom Part 1 ​(a) μx=enter your response here Part 2 σx=enter your response here ​(Round to the nearest tenth as​ needed.) Part 3 ​(b) What is the correct interpretation of the​ mean?     A. It is expected that in a random sample of 300 adult​ smokers, 240 will have started smoking before turning 18.   B. It is expected that in a random sample of 300 adult​ smokers, 240 will have started smoking after turning 18. C. It is expected that in​ 50% of random samples of 300 adult​ smokers, 240 will have started smoking before turning 18. Part 4 ​(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?     A. ​Yes, because 255 is between μ−2σ and μ+2σ.   B. No​, because 255 is greater than μ+2σ.   C. Yes​, because 255 is greater than μ+

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