How do you find the z-score for an IQ test score of 142 when the mean is 100 and the standard deviation is 15?

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Answer 1 · 2017-11-15T20:04:07

#z=2.8#

we use the standardising formula

#z=(X-mu)/sigma#

#X=#the score

#mu=#the mean

#sigma=#the standard deviation

#:.z=(142-100)/15#

#z=2.8#