the average weight of 10 students is 68.2kg later on it was discovered that weight of 1 student is taken wrongly as 49.5insteed of 59.5and 1student in the weight of 48kg left the hostal calculate correct mean
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Answer:
71.55
Explanation:
total weight =x
average= ×/10
= 68.2
which means
sum(×)= 68.2×10
= 682
correct weight =59.5
wrong weight= 49.5
the average is less as the sum is less by 10( 59.5-49.5)
adding 10 to 682 will give us the correct weight =692
now, a boy of 48 kg left
this means
total weight = 692-48
=644
no of boys =9
new average =644÷9 = 71.55
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