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23 February, 15:21

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.

+4
Answers (1)
  1. 23 February, 17:30
    0
    4.8

    Step-by-step explanation:

    z = (x - μ) / σ

    2.5 = (90 - 78) / σ

    σ = 4.8
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