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16 July, 00:22

Length of pregnancies have a mean of 267.6 days and have standard deviation of 15.1 days. A woman tracked her pregnancy and found it to be 309 days. find the Z score for 309. is such length unusual

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  1. 16 July, 02:22
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    Z score = x-mean/standard deviation

    (309-267.6) / 15.1=2.4717
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