SOLUTION: A particular IQ test is standardised to a normal model, with a mean of 120 and a standard deviation of 7. Using empirical rule determine about what percent of people should have IQ
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Question 1163024: A particular IQ test is standardised to a normal model, with a mean of 120 and a standard deviation of 7. Using empirical rule determine about what percent of people should have IQ scores between 106 and 127? Answer by Boreal(15235) (Show Source):
You can put this solution on YOUR website! This is between -2 and +1 sd (z=(x-mean)/sd
on the left side, -2 to 0 is 47.5%, half of the 95% between +/- 2 sd s
on the right side 34% is between the mean and +1 sd (half of 68%). This would make the total probability 0.815. The actual value is 0.8186.
