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Math · Statistics And Probability
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Example4: Scores on the Stanford-Binet Intelligence Test are normally distributed with mean H 100 and standard deviation a 16. (a) Determine the 90 percentile of IQs. (b) Determine the IQs that make up the middle 70% of IQs. Practice: The reading speed of 6th grades is approximately normal, with a mean speed of 125 words per minute and a standard deviation of 24 words per minute. (a) What is the reading speed of a 6th grader whose reading speed is at the 95th percentile? (b) A school psychologist wants to determine reading rates for unusual students (both slow and fast. What are the cutoff points for the unusual readers?
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