A sample of size 25 will be drawn from a population with mean and standard deviation . (a) Is it appropriate to use the normal distribution to find probabilities for ? (b) If appropriate find the probability that will be less than . (c) If appropriate find the percentile of .

So don't take my word i'm not exactly a mathematical person but i would assume a. because while selling the soap every month you increase in sells so you would by 11 percent. the you would get the factor 0.89 which if i had to guess would be the monthly profit over 11 probably wrong tho