### 3 Answers

Relevance

- Wayne DeguManLv 72 months ago
We require P(-1.03 < z < 2.54)

i.e. P(z < 2.54) - P(z < -1.03)

so, P(z < 2.54) - P(z > 1.03)

or, P(z < 2.54) - [1 - P(z < 1.03)]

Hence, P(z < 2.54) + P(z < 1.03) - 1

From normal table we get:

0.9945 + 0.8485 - 1

i.e. 0.843

:)>

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