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Some IQ scores are standardized with a mean of 100 and a standard deviation of 16. Using the 68-95-99.7 Rule, Determine: What percent of people would have an IQ score 68 and 84.

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Do wou mean BETWEEN 68 and 84?

the mean score in std 6 test was 72and the standard diviation was 9. calculate the z score for a pupil who scored 42

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