Answers

2016-03-04T12:11:24+05:30
Mean of excluded one no. 
-----------------------------------   = 28
            5
mean of excluded one no.  = 140

The mean of 5 nos. = 30
sum of 5 nos              
------------------  =   30
       5
sum of 5 nos = 150   
sum of 4 nos. + x =150

140 + x   = 150
      x = 150 - 140
     x = 10
so excluded number is 10



0