posted by Felicia .
For the standard normal random variable Z, compute the following probabilities. For the following problems, use four decimal places.
P (0 less than or equal to Z less than or equal .9)
P (-1.3 less than or equal to Z less than or equal to)
P(Z > 2.5)
P(Z greater than or equal to -.75)
P(Z < .05)
P (Z less than or equal to -.72)
random variables -
Assuming that you mean the Z score (Z = (score-mean)/Standard deviation), find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportions related to the above Z scores.