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A sample of 500 evening students revealed that their annual incomes from employment in industry during the day were normally distributed with a mean income of $30,000 and a standard deviation of $3,000. (i) 250 students earned more than $30,000.
(ii. 341 students earned between $27,000 and $33,000.
(iii) 239 students earned between $24,000 and $30,000.
Field of Psychology
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