Question

Roma knows about how to find the arithmetic mean from the given data (which is 53) but she has
confused how to find the unknown term so she asked to her father to help for this type of problem
Class
Frequency
0-20
12
20-40
15
40 - 60
32
| 60 - 80
k
80 - 100
13​

Answer 1

Answer:

K= 28

Step-by-step explanation:

Hope this helps you

Thank you....

Answer 2

Value of k =28

Step-by-step explanation:

As per the table formed (refer attachment)

$\bar{x} = a+[\frac {\sum fiui}{fi}] \times h$

$53 = 70 + [\frac {-85}{72+k}] \times 20$

$-17 = \frac {-85}{72+k} \times 20$

-1224 -17k = -1700

17k = 1700 - 1224

17k = 426

k = 28