Multiple Choice Questions on In an experiment the average of 11 observations was 90 If the average of the first five observations........... for SBI (Clerical) Exam Preparation

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Multiple Choice Questions

In an experiment the average of 11 observations was 90 If the average of the first five observations...........

Quantitative Aptitude (SBI-CL) Average
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    In an experiment, the average of 11 observations was 90. If the average of the first five observations is 87, and that of the last five is 84, then the sixth observation is

    135

    Correct Answer

    145

    Incorrect Answer

    150

    Incorrect Answer

    165

    Incorrect Answer
    Explanation:

    6th observation = 90 + 5 x (90 - 87) + 5 x (90 - 84)
    = 90 + 5 x 3 + 5 x 6 = 135

    Hence, option 1 is the correct answer.

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