Math, asked by priyankasawant4885, 1 year ago

If the mean of the following distribution is 24,Find the value 'a

Mark 0-10,10-20,20-30,30-40,40-50

No. 7, a,8,10,5
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Answers

Answered by Anonymous
28
hope this helps you ☺☺ ...

Answer is 10..
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Answered by SushmitaAhluwalia
19

The value of a is 10.

  • We know that mean for grouped data is given by

                mean = \frac{sum(f_{i} x_{i}) }{sum(f_{i}) }

  • Given,

                   mean = 24

                       24=\frac{810+15a}{30+a}

                       24(30+a) = 810 + 15a

                       720 + 24a = 810 + 15a

                       24a - 15a = 810 - 720

                                9a = 90  

                                  a = 90/9

                               ∴ a = 10

             

Please refer attachment for table and calculations.

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