I hope you can also explain what formula that I should use, and I was supposed to use the table.

W3: Exercise 1. A random sample of size 12 is taken from a population which is normally distributed with a mean 33 and variance 12.Find the probability that the sample mean a. is less than 36 b. is not more than 40.5 o. lies between 37.2 and 40.8 [9] 2. A random sample of size 40 is taken from the binomial distribution B(50,0.4).Find the probability that the sample mean a.is more than 19 b.|ies between 13.5 and 20.5 [6]