# random variables

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For the standard normal random variable Z, compute the following probabilities. For the following problems, use four decimal places.

16.
P (0 less than or equal to Z less than or equal .9)

17.
P (-1.3 less than or equal to Z less than or equal to)

18.
P(Z > 2.5)

19.
P(Z greater than or equal to -.75)

20.
P(Z < .05)

21.
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.

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