Round 3184.5641 to two decimal points?

Look at attachment. has all info needed. need

The distribution of the amount of money spent by students for textbooks in a semester is approximately normal in shape with a mean of $235 and a standard deviation of $20. according to the standard deviation rule, how much did almost all (99.7%) of the students spend on textbooks in a semester?

Adam used 1072.4 gallons of water over the course of 7 days. how much water did adam use, on average, each day?