**A**: P(X<73.6) = 10%

- In Excel: z = NORMSINV(10%) = -1.28.
- A z-score of -1.28 means that the original score/observation is 1.28 standard deviations
**below**, not above, the mean.

- A z-score of -1.28 means that the original score/observation is 1.28 standard deviations
- Since z = (X - m)/s, X = z*s + m = -1.28*5 + 80 = 73.6.

*Category: Quantitative Analysis > Probability*

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