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 16.

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Solution

The correct option is A
12

Sum of all the observations = 15 x 8 = 120.

Sum of first eight observations = 56

Sum of the last eight observations = 80.

Hence, the value of the $8^{t h}$ observation = (80 + 56) - 120 = 16

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Q. The mean of first

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and last

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. If the mean of all

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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 16.

The correct option is A 12 Sum of all the observations = 15 x 8 = 120. Sum of first eight observations = 56 Sum of the last eight observations = 80. Hence, the value of the 8thobservation = (80 + 56) - 120 = 16

The correct option is A
12

Sum of all the observations = 15 x 8 = 120.

Sum of first eight observations = 56

Sum of the last eight observations = 80.

Hence, the value of the $8^{t h}$ observation = (80 + 56) - 120 = 16