Question

The mean of 5 numbers is 30,if one number is excluded there mean becomes 28 find the excluded number ?

Answer 1

Let the numbers be a,b,c,d,e.
Therefore, (a+b+c+d+e)/5=30
a+b+c+d+e=150
Let the excluded number is e
Then, (a+b+c+d)/4=28
a+b+c+d=112
Therefore,(a+b+c+d+e)-(a+b+c+d)=150-112
e=38

Answer 2

        Let the numbers be a,b,c,d,e.
       Therefore, (a+b+c+d+e)/5=30
              a+b+c+d+e=150
        Let the excluded number is e
            Then, (a+b+c+d)/4=28
                   a+b+c+d=112
Therefore,(a+b+c+d+e)-(a+b+c+d)=150-112
                           e=38