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 400 trials of the probability experiment (b) Interpret the mean. (c) Would it be unusual to observe 340 smokers who started smoking before turning 18 years old in a random sample of 400 adult smokers? Why? (a) Hy = 320 Ox = 8 (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 400 adult smokers, 320 will have started smoking after turning 18. O B. It is expected that in 50% of random samples of 400 adult smokers, 320 will have started smoking before turning 18 C. It is expected that in a random sample of 400 adult smokers, 320 will have started smoking before turning 18