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CBSE Class 9 Answered

The mean of the following distribution is 50.  xi 10 30 50 70 90 fi 17 5a + 3 32 7a - 11 19 Find the value of a.
Asked by Topperlearning User | 09 Dec, 2013, 10:36: AM
answered-by-expert Expert Answer

xi 

10

30

50

70

90

fi

17

5a + 3

32

7a - 11

19

fixi

170

150a+90

1600

490a-770

1710

Mean = 

Answered by | 09 Dec, 2013, 12:36: PM

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