Question

Can anybody help with with this question
Class 10

Answer 1

Answer:

Step-by-step explanation:

C. I        F      X    fx

11- 13     3      12   36  

13- 15     6     14    84  

15- 17     9      16    144  

17 - 19    13     18    234

19 - 21    K      20    20k  

21-23      5     22    110  

23-25     4     24      96

∑f = 40 + k ∑ f x = 704 + 20 k

Mean = ∑ f x / ∑f

18 x 40 + k = 704 + 20 k

720 + 18 k = 704 + 20k

2 k = 16

k = 8