Question

The weight of 5 persons are 67,65,71,57 and x. Find the value of x if arithmetic mean of their weights is 61 kg

Answer 1

Answer:

Step-by-step explanation:

mean is equal = sum of observation /number of observation

So (67+65+71+57+x)/5=61

260+x=305

x=305-260=45

Answer 2

The value of x is 45

Step-by-step explanation:

Given:

weight of persons as 67, 65, 71, 57, x

arithmetic mean = 61

To find:

value of x

Solution:

By the formula of mean,

Mean =  sum of observations

              no. of observations

∴ Mean = $\frac{67+65+71+57+x}{5}$

∴ Mean = $\frac{260+x}{5}$

∴ $61=\frac{260+x}{5}$

∴ $61 (5) = 260+x$

∴ $305= 260+x$

∴ $x= 305-260$

∴ $x = 45$

Thus, the value of x will be 45 kg