Question

The mean of 25 observation is 27.If one number is included the mean still remains the same.Find the included observation.​

Answer 1

Step-by-step explanation:

The mean of 25 observations is 27

So,

The total sum of all the 25 observations =27×25=675

After one observation is included

Now, the mean of 26(25+1)numbers=27

So,

The total sum of all the 26 observations =27×26=702

Hence,

The included observation =702−675=27

Answer 2

Answer:

Given

The mean of 25 observations is 27

So,

The total sum of all the 25 observations =27×25=675

After one observation is included

Now, the mean of 26(25+1)numbers=27

So,

The total sum of all the 26 observations =27×26=702

Hence,

The included observation =702−675=27