According to an almanac, 60% of adult smokers started smoking before turning 18 years old. K (a) Compute the mean and standard deviation of the random variable X, the number of smokers who started smoking before 18 based on a random sample of 400 adults. (b) Interpret the mean. (a) Hx = ox =(Round to the nearest tenth as needed.) (b) What is the correct interpretation of the mean? O A. It is expected that in a random sample of 400 adult smokers, 240 will have started smoking before turning 18. O B. It is expected that in a random sample of 400 adult smokers, 240 will have started smoking after turning 18. O C. It is expected that in 50% of random samples of 400 adult smokers, 240 will have started smoking before turning 18