    Question

# The mean of 15 observations is 8. If the mean of the first eight observations is 7 and that of the last eight observations is 10, then the value of the 8th observation is _____.

A

16

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B

15

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C
14
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D
13
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Solution

## The correct option is A 16 We know that, Mean = Sum of all observationsNumber of observations Sum of values of all the observations =Mean×Number of observation =15×8 =120 So, sum of the first eight observations =Mean×Number of observation =7×8 =56 Sum of the last eight observations =Mean×Number of observation =10×8 =80 Hence, value of the 8thobservation =(80+56)−120 =16  Suggest Corrections  0      Similar questions  Related Videos   Measures of Central Tendency
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