According to Information Please Almanac. 80% of adult smokers started smoking before turning 18 years of age. Assume 10 smokers, 18 years of age or older are randomly chosen and the number of smokers who started smoking before 18 is recorded.
1. Find out the probability P (1.23)
2. Suppose the random variable X is normally distributed with the mean =50 and standard deviation =7 find out P(X)