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Scores on IQ tests have a symmetric distribution that is roughly bell-shaped.?
Scores on IQ tests have a symmetric distribution that is roughly bell-shaped. Reported IQs are scaled so that the distribution has a mean of 100 and a standard deviation of 15.
what percentage has an iq score between 80 and 120? (i know this is 95, via emperical rule)
what percentage has an iq score less than 70 or greater than 130?
what percentage has a score greater than 120?
if you could show me the steps i would appreciate it very much. im taking a statistics course via distance learning so i dont get much interaction with her.
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