1. 1.GIL internet services record customer usage patterns.Historically they have found the duration of an internet session is normally distributed with a variance of 550.2 minutes².What is the probability of a randomly selected internet session being more than half an hour either side of the mean internet session duration?(4 decimal places)

2.The marks on a midterm test are normally distributed with a mean of 72.3 and a standard deviation of 10.2. Find the probability that a class of 38 has an average less than 70. (4 decimal places)