the mean weight of 120 students of a school is 52. 75 kg if the mean weight is 50 of them is 61 kg find the mean weight of the remaining students
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Step-by-step explanation:
mean of 120 student = 52.75
total weight of 120 student = 52.75×120=6330
mean of 1st 50 student = 51
total weight of 50 student = 51×50=2550
so weight of last 70 student = 6330-2550=3780
mean weight= 3780/70=54.
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