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Today at 8:06 AM
Mathematics

Answered

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.

Answer :

MathPhys MathPhys

Today at 8:11 AM

Answer:

4.8

Step-by-step explanation:

z = (x − μ) / σ

2.5 = (90 − 78) / σ

σ = 4.8

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