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statistics

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Assume that blood pressure readings are normally distributed with a mean of 123 and a standard deviation of 9.6. If 144 people are randomly selected, find the probability that their mean blood pressure will be less than 125.

  • statistics - ,

    z = (125-123)/(9.6/sqrt(144)
    z = 2/(9.6/12)
    z = 2.5
    z-table
    1-.0062 =0.9938

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