A standard I.Q. test produces normally distributed results with a mean of 104 and a standard deviation of 16 for 52,000 students
2 answers:
The IQ scores are RVs (X) normally distributed with mean and standard deviation
.
The probability is calculated after converting the raw score to the standard score,
.
Now use normal distribution table or technology,
.
Thus, the number of people who would have I.Q.s below 76 out of 52,000 is
.
Therefore, the approximate number is .
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