plz give me some explanation, thanks

Suppose X1 and X2 are both normally distributed random variable with population mean 10 and population variance 9 . If X1 and X2 have a population correlation of 0.7 , then the probability that the average of X1 and X 2 lies between 8 and 11 is closest or equal to Q 0.0412 Q 0.4064 0 0.2348 0 0.5936 The probability that a standard normal random variable is greater than z is equal to 0.013903 . z is closest or equal to 3 -2.2 There are not enough information to inference the answer O 2.2 1.8