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The Normal Distribution

AP Statistics· difficulty 4/5

A normal random variable has μ=100\mu = 100, σ=15\sigma = 15. The fraction below 70 is approximately

  • A

    0.9750.975

  • B

    0.0230.023

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  • C

    0.1590.159

  • D

    0.5000.500

Explanation

z = (70-100)/15 = -2. P(Z < -2) ≈ 0.023.

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