Hi, 

Estimate the mean study time of all students taking an exam

18,7,10 ,13,12,16,5,20,21

18+7+10+13+12+16+5+20+21=122  Yes!

 mean = 122/9 = 13.6 hr,  Rounded to the nearest tenth of an hour



5,7,10,12,,16,18,20,21 (median 13)

  

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