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15 August, 21:10

Four students took a national standardized test for which the mean was 500 and the standard deviation was 100. If a student's z-value was 1.75 on the test, what was the student's score?

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  1. 15 August, 21:39
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    X is a normally distributed variable with mean μ = 30 and standard deviation σ = 4. Find

    a) P (x < 40)

    b) P (x > 21)

    c) P (30 < x < 35)
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