Question

The numbers 4 and 9 have frequencies x and (x – 1), respectively. If their arithmetic mean is 6, then x is equal to

Answer 1

Answer:

Step-by-step explanation:

Since the value of arithmetic mean is the product of frequency and values divided by total number of values.

Here the total number of values are 2.

Hence, the frequency deviation fixi will be as follows.

xi. fi. fixi

4. x. 4x

9. (x-1). 9x-9

Total= 13x - 9

Hence, arithmetic mean will be (13x-9)/2=6

Now, we can calculate the value of x from the equation which will be x=21/13 = 1.61.