We want to estimate the average and the total income of the 1000 citizens of a village. With the aid of small preliminary sample of size 20 from this population, we calculated a

average income of $ 40,000 and a corrected standard deviation of $ 2,000.

Determine the sample size so that the margin of error is $ 200 in

estimate of average income per citizen.

a) 279 b) 286 c) 293 d) 300

e) 325 f) 350 g) 375 h) 400