Answers

2016-01-29T20:14:50+05:30
Mean= sum of all observations/ no. of observations

mean=2+4+6+8+10+12+14+16+18+20/10
          =110/10
           =11
0
2016-01-29T20:16:21+05:30
The first 10 even numbers = 2,4,6,8,10,12,14,16,18,20
No.of observations = 10
Sum of observations = 110
Mean = sum of observations/no.of observations
= 110/10
= 11
Therefore mean of first 10 even numbers = 11
0