Tutor AV

Question

 The mean of 5 numbers is 18. If one of the numbers is excluded, their mean is 16. Then the excluded number is ___?

Answer:

The excluded number is 26.




Please feel free to comment below for a detailed discussion/worked out solution to this problem.
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2 comments:

  1. Unknown9 February 2013 at 08:06

    Thanks. Explain please?

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    Replies
    1. TutorsAV9 February 2013 at 08:10

      We know that mean of the 5 numbers is 18. Therefore, their sum is going to be 18*5=90.
      When one number is excluded, the mean of the remaining 4 numbers comes out to be 16 and therefore, we get the sum of the remaining numbers as 16*4=64.
      Thus, the excluded number is 90-64=26.

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