3. According to the American Lung Association, 9095 of adult smokers started smoking before turning 21 vears old. Ten smokers 21 1vea rs old or older are ra ndomlvr selected. and the number of smokers who started smoking before 21 is recorded. a. Find the orobabilltv that at least 3 of them started smoking before 21 vears of age. b. Find the probability that between F and 9 of them, inclusive. started smoking before 21 vears of age. d. a. Compute the mean for the random variable described in #3. b.Compute the standard deviation for the random variable descrlbed ln #3. 5a. Determine the area under the standard normal curve that lies to the right of z = -.55. b.Determine the area under the standard normal curve that lies between 2 = 3.03 and I = 1.93 Ea. Find the tsoore such that the area under the standard normal curve to its left is .2 b.Fii'ld 1'01