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Unformatted text preview: 34. A company makes three diﬀerent size tennis rackets. A small racket requires 1 unit of string, 2 units of rubber, and 3 units of
titanium. A medium racket requires 2 units of string, 3 units of rubber, and 4 units of titanium. A large racket requires 3 units
of string, 4 units of rubber, and 5 units of titanium. Each unit of string costs $1.50, each unit of rubber costs $2.25, and each
unit of titanium costs $1.75. For a particular order, 200 small rackets, 150 medium rackets, and 80 large rackets are requested.
Management has decided that Factory A will produce 150 of the small rackets, 50 of the medium rackets, and 60 of the large
rackets. The remaining rackets of each size will be produced at Factory B. Put the above information into three matrices and
then determine what matrix operation will tell you the cost of ﬁlling the order at each factory. 35. Let X be a normal random variable with a mean of 0 and a standard deviation of 8. Find the value of b if P (−b < X < b) =
0.9826. 36. A company makes two brands of cereal, brand A and brand B. A serving of brand A cereal has 3 ounces of ﬂakes, 3 ounces of
nuts, and sells for $4. A serving of brand B cereal has 6 ounces of ﬂakes, 2 ounces of nuts, and sells for $2. How many servings
of each type of cereal would maximize revenue if you have 24 ounces of ﬂakes and 12 ounces of nuts available? Are there any
leftover resources? 37. Graph the system of linear inequalities:
7x + 3y ≥ 30
3x + 5y ≥ 24
5x + 4y ≤ 40
x ≥ 0, y ≥ 0 38. A True/False Exam consists of 15 questions. In how many ways can the exam be answered so that the student answers at least
10 questions correctly? 8 ...
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This note was uploaded on 03/04/2012 for the course MATH 141 taught by Professor Jillzarestky during the Fall '08 term at Texas A&M.
 Fall '08
 JillZarestky

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