# The mean of 6 observations is 17.5. If five of them are 14,9,23,25 and 10, find the sixth observation.

2
by kakkar6644

2015-11-25T21:01:11+05:30

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The mean of 6 observations is 7.5 so their sum is 17.5×6=105. But the sum of 5 of them is 14+9+23+25+10=81. So the 6th number is 105-81=24.
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I have to also see shalini's answer
2015-11-25T21:02:27+05:30

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Mean =sum of observations
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no of observations

17.5 = 14+9+23+25+10+x
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6

17.5 = 81+x
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6

81+x =17.5 x 6
x = 105-81 =24
sixth observation is  24
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