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Statistics

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assume that adults have IQ scores that are normally distributed with a mean of 105 and a standard deviation of 15 find the probability that a randomly selected adult has an IQ between 89 and 121 ?

  • Statistics - ,

    Convert to z-score using
    (X-μ)/σ
    where X=89 or 121, σ=15, μ=105.
    Look up normal distribution table to find probability enclosed between these two z-scores.

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