Next TWO questions (3 and 4) are related

3) A researcher conducting a study of the cost of a 4-year college degree in the Northeast reported that the standard error of the mean was $1095.The population standard deviation is $16425.What is the sample size in this study?

a 250 b 225 c 200 d 175 \

4) The margin of sampling error for an interval which captures 95% of all sample means in the previous question is:

a 1402 b 1796 c 2146 d 2551