Question: ABS data show that young full-time students work an average of 15 hours per week. If the number of hours worked is normally distributed with

ABS data show that young full-time students work an average of 15 hours per week. If the number of hours worked is normally distributed with this mean and 10% of students work more than 25 hours a week, what is the standard deviation of the number of hours worked by students?

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