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statistics

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The height of 18-year-old men are approximately normally distributed, with mean of 68 inches and a standard deviation of 3 inches. What is the probability that an 18-year-old man selected at random is between 67 and 69 inches tall? Round your answer to the nearest thousandths place (3 places).

  • statistics - ,

    Use z-scores and a z-table to find your probability.

    Formula:
    z = (x - mean)/sd
    mean = 68
    sd = 3

    Find two z-values, using 67 and 69 for x.

    Next, check a z-table for the probability between the two z-scores.

    I hope this will help get you started.

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