Are you using tables?

Your textbook or class notes should have salient examples to follow. You will need to be much more specific in stating what you can and can't do.

Note:

If using tables, you first need to convert X-values to Z-values.

a. = Pr(X < 85) - Pr(X < 75) = ....

b. .

c. = 1 - Pr(X < 95) = ....

d. = Pr(X > 98) + Pr(X < 62) = 2 Pr(X > 98) (since 80 is the mean) = 2 (1 - Pr(X < 98)) = ....

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There are two things you should never try to prove: the impossible and the obvious.

The greater danger for most of us lies not in setting our aim too high and falling short; but in setting our aim too low and achieving our mark. (Michelangelo Buonarroti)

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