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SAT scores are normally distributed with a mean of 1518 and a standard deviation of 325. What scores correspond to P20 and P65?

  • statistics -

    What do you mean by "P20 and P65"?

    If I assume that those are percentiles, find table in the back of your statistics text labeled something like "areas under normal distribution" to find the Z scores corresponding to the proportions indicated. Insert the values into the following equation.

    Z = (score-mean)/SD

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