Answers
(1) A, B, C , F, and H are correct
E(
1)=
, here n=1, so A is true and variance(1)=
,
E(2)=, here n=10, so B is true and variance(2)=/10
E(3)=, here n=2 so C is true and variance(3)=/2
since variance of 2 is less than variance of 1, so F is ture
but variance of 3 is not less than 2 so G is not true
here population distribution is not mentioned so it distribution of estimator may not be normal, so D and E are not true
(2) right choice is 
variance(2)=/10, and
standard deviation=
since this is repeated 100 times so required answer would be
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