Practice Test Discussion

Q)

The average of 18 observations is recorded as 124. Later it was found that two observations with values 64 and 28 were entered wrongly as 46 and 82. The correct average of the 18 observations is?

    • Explanation

    Given,

    Average of 18 observations is recorded as, 124

    ⇒18×24= 2232

    Later, it was found that two observations with values 64 and 28 were entered wrongly as 46 and 82

    Correct total of 18 observations

    =2232-(46+82)+(64+28)

    =2196

    The correct average of the 18 observations=219618=122

    Hence, Option B is correct.

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