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Normally distributed with a mean

Assume that adults have IQ scores that are normally distributed with a mean of 100 and a standard deviation of 15.

Find the probability that a randomly selected adult had an IQ greater than 131.5 (the requirement for membership in the Mensa organization). Round to the nearest thousandth.

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## Q : Degress of freedom

The critical chi-square value for 15 degress of freedom when a=0.05 and the test is right-tailed is 24.996