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24 July, 18:23

Find the z value such that 39% of the standard normal curve lies between - z and z.

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  1. 24 July, 18:33
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    Use symmetry and find z so that probability is:

    (100-39) / 2

    =61%

    =30.5%~0.305

    From the z-table:

    z=-0.51

    Answer: - 0.51
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