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CBSE Class 9 Answered

The mean of the following distribution is 50. xi 10 30 50 70 90 yi 17 5p + 3 32 7p - 11 19 Find the value of p.
Asked by Topperlearning User | 09 Dec, 2013, 10:33: AM
answered-by-expert Expert Answer

xi

fi

fixi

10

17

170

30

5p + 3

30(5p + 3)

50

32

1600

70

7p - 11

70 (7p - 11)

90

19

1710

Mean =  

50(60 + 12p) = 2800 + 640p

3000 - 2800 = 640p - 600p

200 = 40p

Hence, p = 5

Answered by | 09 Dec, 2013, 12:33: PM

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