A town has 5000 residents. A survey finds that 81 residents out of a random sample of 625 residents have red hair. The margin of
error for the survey is 4%. Find the interval in which the total number
of residents with red hair is most likely to lie.

Saline iv fluid bags cost $64.20 for 24, 1000 ml bags from one supplier. a new supplier sells 500 ml bags for $2 each. the hospital uses about 10,000, 1000 ml bags each month. nurses report that about half of the bags are more than half full when they are discarded. if you are going to use only one supplier, which size bag provides the best deal, and how much will you save each month? compare the cost of the new supplier to the current one.