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27 March, 17:07

Find the value of the standardized z-test statistic and the area above 140 for a N (160,25) distribution. Round your answer to three decimal places. A) z = - 0.8, area = 0.212B) z = - 0.8, area = 0.788 C) z = 0.8, area = 0.212 D) z = 0.8, area = 0.788

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  1. 27 March, 20:38
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    B

    Step-by-step explanation:

    standard z-test statistic=x-mean/standard deviation

    N (160,25) ⇒N (mean, standard deviation)

    mean=160

    standard deviation=25

    x=140

    z=140-160/25=-20/25=-0.8

    area above 140=P (z>0.8) = P (-0.8
    so z=-0.8, area=0.7881
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