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6) The annual precipitation amounts in a certain mountain range are normally distributed with a mean of 88 inches, and a standard deviation of 10 inches. What is the likelihood that the mean annual precipitation during 25 randomly picked years will be less than 90.8 inches?

  • math - ,

    z = (x -mean)/(sd/sqrt(n))

    z = (90.8-88)/(10/sqrt(25))

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