Question

the mean monthly income of three members of a family is 8000. Another member of the family gets job and his monthly salary is 10000. what is the mean monthly income of the four earning members of the family.

Please Help

Answer 1

Answer

Hello Dude,

Formula for mean = sum of all observation/ total observations

Let’s say that sum of observations=. x

So x/3=8000

x=24000

So now sum of all observations=24000+10000=34000

So new mean=34000/4

Answer= 8500 Rs

Answer 2

$\textbf{\huge{ANSWER:}}$

$\sf{Given:}$

Mean of the Income of 3 members = Rs. 8000

The fourth member gets = Rs. 10000

$\sf{To\:Find:}$

The mean of all the members of the family

$\sf{Solution:}$

Let the total income of the 3 members be = x

Mean = $\tt{\frac{No.\:of\:observations}{Total\:no.\:of\:observations}}$

=》 8000 = $\tt{\frac{x}{3}}$

=》 $\boxed{\tt{x = Rs. 24000}}$

Total sum of all the members = Rs. 24000 + Rs. 10000

=》 $\tt{Rs. 34000}$

Mean = $\tt{\frac{34000}{4}}$

=》 $\tt{\boxed{\boxed{Rs. 8500}}}$

Suggestions : In these types of questions, you first need to note down all the information given in the question, as we did in the very starting of the answer. Then, you need to see how how can co-relate the information and then finally solve it. You can go through the answer again for more understanding and do ask the doubts in the comments section.