Question

find the value of K, if the mean of distribution os 20

Answer 1

Answer:k=1

Step-by-step explanation:

Procedure 1:-

2+3+4+5k+6=20

15+5k=20

5k=5

k=1

Procedure 2:-

x values are in ap with common difference 2

20+k=21

k=1

Answer 2

Here we will use the method of ∑ ( sigma ). Since here frequency and data is given so value of ∑ will be f(i)x(i).

In order to take out mean we will divide this value of ∑ by total sum of frequencies i.e., f(i).

Here, mind that X( bar ) is mean whose value is given 20 and N is total number of frequencies.

Please refer to attachment.