The I . Q . of students of a school was found to be normally distributed with a mean µ = 116 and a standard deviation of σ = 8 . What % age of children have I . Q . fr om 100 to 124 .
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Expert's answer
2012-07-03T11:35:10-0400
We use a z-statistic. z-value for 100 is (100-116)/8=-2. Using z-table we get that 22.8% of children have IQ lower than 100; z-value for 124 is (124-116)/8=1. Using z-table we get that 84.13% of children have IQ lower than 124;
So, the percent of children with IQ between 100 and 124 is 55.33%
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