A total of 147 students took Exam 2.

Here are approximate letter grades for Exam 2; please note that we do
not record letter grades in the gradebook, only raw exam scores.

Grade	Score		Number	Percent
A 	90 and above	25	17%
B	80--89		59	40%
C	65--79		51	35%
D	50--64		10	 7%

-------------------------------------------------------------------------

Exam 2 Summary

> summary(exam2)
 Min. 1st Qu. Median  Mean 3rd Qu. Max. 
   46      75     81 80.07      88   99
> sqrt(var(exam2))
[1] 10.22426


> stem(exam2)

N = 147   Median = 81
Quartiles = 75, 88

Decimal point is 1 place to the right of the colon

Low:   46

   4 : 9
   5 : 13
   5 : 567
   6 : 12333
   6 : 56889
   7 : 0111222222333344444
   7 : 555555556666666777778888999
   8 : 00000111111222223333333334444
   8 : 555555566666677788899999999999
   9 : 000111111222233334444
   9 : 5679

------------------------------------------------------------------------