Answers

2016-04-09T00:15:03+05:30
Total no. = 45×18 = 810
then remaining = 75 - 45 = 30 ; 30×13 = 390
so, total nos. are 810+390 = 1200
so, mean = 1200 / 75 = 240/15 =48/ 3 =16
therefore mean = 16
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