The mean of number is 80 , out of which mean of 4 number is 46, find th 5th number?
1. 4
2. 20
3. 434
4. 66
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Step-by-step explanation:
let the number be x.
Mean = Sum of all observations
No. of observations
Given :- 46 = Sum / 4
Therefore the sum of 4 no.s is 46*4 = 184
therefore,
80 = 184 + x / 5 (Given)
400 = 184 + x
Therefore, x = 400 - 184 = 216
Therefore the fifth no. is 216.
(you may recheck by replacing 216 as the no.)*
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THANK YOU.
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