Studies by the U.S. Dept. of Education have shown that when full-time undergraduate students work at a part-time job more than 15 hours/week, their grades suffer and time to graduation is extended.  If the NCSU financial aid office wants to estimate the mean hours worked per week by NCSU undergrads to within .5 hour with 95% confidence, how many students should they sample?  Assume the range of hours worked per week is 10 to 22 hours.   a) 8 b) 62 c) 47 d) 44

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