The mean weight of a class of 34 students is 465 kg If

The mean weight of a class of 34 students is 465 kg If
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The mean weight of a class of 34 students is 46.5 kg. If the weight of the teacher is included, the mean rises by 500 g. 
Find the weight of the teacher. 

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Right Answer is:

SOLUTION


Now Average Weight Of Class = 46.5 kg

Now Average Weight = Total Weight/Number

46.5 = Total Weight/34

Total Weight = 46.5*34 = 1581

Now If Teacher Is Included

Let Weight Of Techer Be x kg

Now

Total Weight = 1581+x

Now Number = 35

Average Weight = 46.5+0.5 = 47

So

1581+x/35 = 47

1581+x  = 1645

x = 64

So Weight Of Teacher Is 64 Kg

 

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