Chap 6 Grading Key

Assigned 2/16 Due 2/23 Returned 3/2

[Point number]

6.17
[1] (A) 1 / 7 or .14
[2] (B) 2 / 7 or .29
[3] (C) 2 / 6 or .33

6.18
[4] (A) 10 / 150
[5] (B) 26 / 150
[6] (C) 16 / 140
[7] (D) Solution 1 is 16 / (140 � 5) = .0229       Solution 2 is 16 / [(124 � 5) + (16 � 2.5)] = .0242       
Solution 2 is conceptually better but solution 1 is close enough. [Discuss in class.]

6.19
(A) 300 / 25,000 � 1,000 = 12
[8] (B) 250 / 25,000 � 1,000 = 10
[9] (C) 3 / 300 � 1,000 = 10
[10] (D) 75 / 2500 � 1,000 = 30