If al Ib and d Id, which pair of angles are congruent? la
1b
12
5/6
3/4
7/8
C
d
9/10
13/14
11/12
15/16
1 and 16
5 and 8
9 and 11
12 and 13

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?