Statistics Examples

$0.9 \leq z \leq 2.8$

Step 1

Find the value in a look up table of the probability of a z-score of less than $0.31597312$ .

$z = 0.9$ has an area under the curve $0.31597312$

Step 2

Find the value in a look up table of the probability of a z-score of less than $0.49746442$ .

$z = 2.8$ has an area under the curve $0.49746442$

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.

$0.49746442 - (0.31597312)$

Step 4

Find the area between the two z-scores.

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Step 4.1

Multiply $- 1$ by $0.31597312$ .

$0.49746442 - 0.31597312$

Step 4.2

Subtract $0.31597312$ from $0.49746442$ .

$0.18149129$