Finite Math Examples

- 0.86 < Z < 2.25

$- 0.86 < Z < 2.25$

Step 1

Find the value in a look up table of the probability of a z-score of less than

0.3051392

$0.3051392$ .

z = - 0.86

$z = - 0.86$ has an area under the curve

0.3051392

$0.3051392$

Step 2

Find the value in a look up table of the probability of a z-score of less than

0.48779388

$0.48779388$ .

z = 2.25

$z = 2.25$ has an area under the curve

0.48779388

$0.48779388$

Step 3

To find the area between the two z-scores, subtract the smaller z-score value from the larger one. For any negative z-score, change the sign of the result to negative.

0.48779388 - (- 0.3051392)

$0.48779388 - (- 0.3051392)$

Step 4

Find the area between the two z-scores.

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Step 4.1

Multiply

- 1

$- 1$ by

- 0.3051392

$- 0.3051392$ .

0.48779388 + 0.3051392

$0.48779388 + 0.3051392$

Step 4.2

Add

0.48779388

$0.48779388$ and

0.3051392

$0.3051392$ .

0.79293309

$0.79293309$

0.79293309

$0.79293309$