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The mean grade on the last Geometry test was 78. If Kate scored a 90 and her z-score was 2.5, find the standard deviation for the test.

The mean grade on the last Geometry test was 78. If Kate scored a 90 and her z-score was 2.5, find the standard deviation for the test.
asked 102k views
4 votes
The mean grade on the last

Geometry test was 78. If Kate
scored a 90 and her z-score
was 2.5, find the standard
deviation for the test.

asked
User Zin Win Htet
by
8.8k points

1 Answer

5 votes

Answer:

4.8

Explanation:

z = (x − μ) / σ

2.5 = (90 − 78) / σ

σ = 4.8

answered
User Yevt
by
7.8k points
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