posted by abc on .
Let X and Y be normal random variables with means 0 and 2, respectively, and variances 1 and 9, respectively. Find the following, using the standard normal table. Express your answers to an accuracy of 4 decimal places.
Let Z=(Y−3)/4. Find the mean and the variance of Z.
First two questions and last.
Z = (score-mean)/SD
SD^2 = variance
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability of the Z score.
Can't figure out these: