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## Answers

Mean= sum of all observations/ no. of observations

mean=2+4+6+8+10+12+14+16+18+20/10

=110/10

=11

mean=2+4+6+8+10+12+14+16+18+20/10

=110/10

=11

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