It is reported that 60% of a certain larg epopulation eat a certain brand of cereal. We randomly select 25 individuals from this population. Let X be teh number of people who eat this certain brand of cereal. Find the probability that 1) at most 10 of them eat this brand of cereal 2)more than 19 of them eat this brand of cereal 3) between 12 and 17 (inclusive) of them eat this brand of cereal? 4) find the mean and standard devation.