Which of the following correctly identifies the set of outputs? {–3, –1, 3, 4} {–5, –2, –1, 4} {(–5, 4), (–2, –1), (–1, 3), (4, –3)} {(4, –5), (–1, –2), (3, –1), (4, –3)}

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?