Please help me with this stat sampling problem.

5. [8 points] An ecologist wants to estimate the number of salamanders on the floor of a woodland area that is 60,000 square feet. On a map the ecologist divides the area into non-overlapping sub-regions each being 600 square feet. The ecologist then draws a simple random sample of 20 of the sub-regions, and carefully searches the floor of each and counts the number of salamanders. The ecologist finds a total of 90 salamanders in the 20 subregions. (The ecologist did not bother to keep the numbers of salamanders in individual sub-regions, and did not compute any standard deviation.) 1) [4 points] Estimate the total number of salamanders in the whole woodland area. 2) [4 points] Give a bound on the error of estimation in Question 1). What assumptions are needed for your