Question

aritmetic mean of five number is 30 .their sum ? ​

Answer 1

Answer:

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Step-by-step explanation:

Let the five numbers be a,b,c,d,e

Then,  

5

a+b+c+d+e

​  

=30 .... (i)

Let the number excluded be a

⇒  

4

b+c+d+e

​  

=28

⟹b+c+d+e=112  

⟹a+112=150 ...... From (i)

⟹a=38

Answer 2

Answer:

The mean of 5 numbers =30

The sum of 5 numbers is =30×5=150

After excluding a number say, x

Mean =28

Sum of four numbers =28×4=112

x=150−112=38