Maths-

General

Easy

Question

# A frequency distribution has arithmetic mean 7.85, then missing term is

- 10 5
- 10 05
- 15 5
- 15

Hint:

### We are given a frequency distribution. We are given the value of its arithmetic mean. We have to find the value of the missing term.

## The correct answer is: 15

### The formula of arithmetic mean is

Here x_{i }is the quantity whose frequency we measure.

f is the frequency of that quantity.

N is sum of all the frequencies. Here it means total number of workers.

N = 10 + x + 13 + 8 + 5 + 4

= 40 + x

We are given m = 7.85

Now, we will substitute all the values and find the answer.

So, the missing term is 15.

For such questions, we need the the formula for arithmetic mean.

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