# Prob/Stat Questions

10. and 11. For a population with mean of 14 and standard deviation of 2.5 ...

How many standard deviations is 16.5 from the mean?

What number is -3.1 standard deviations from the mean?

12. Find the cumulative area under a standard normal curve that corresponds to a z-score of 2.25.

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#### Solution Preview

10. Subtract 14 from 16.50:

16.50 - 14 = 2.5 (i.e. 1 standard deviation)

The number 16.5 is 1 standard deviation ...

#### Solution Summary

This problem set has three questions that involve means, standard deviations, and z-scores.

$2.19