Question

If the mean of the following data is 14 7 find the values of p and q see the image​

Answer 1

Answer:

class     freq        total

0-6           10         3 * 10

6-12         p           9 * p

12-18       4          4 * 15

18-24       7          7 * 21

24-30       q          27 * q

30-36        4          4 * 33

36-42        1         1 * 39

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total       40        408 + 9p + 27 q

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total of frequencies = 26 + p + q = 40   =>    p+q = 14

sum =   408 + 9 p + 27 q = 14.7 * 40 = 588

So finally,     9 p + 27 q = 180       =>  p + 3 q = 20

  =>   14- q + 3 q = 20     =>  q = 3     and    p = 11 .

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