If the arithmetic mean of the following data is 7, thena+b=       xi4679        fia4b5 

If the arithmetic mean of the following data is 7, then

a+b=

       xi4679
        fia4b5

 

  1. A

    4

  2. B

    2

  3. C

    3

  4. D

    cannot be determined 

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    Solution:

      We have,

     7 = 4a+24+7b+45a+4+b+5 4a+7b+69=7a+7b+63a=2

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