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MATH 106 QUIZ 6 Extended due date: Wednesday, July 20, 2016 NAME: _______________________________
I have completed this assignment myself, working independently and not consulting anyone
except the instructor.
INSTRUCTIONS There are 6 problems on 5 pages. This quiz is open book and open notes. This means that
you may refer to your textbook, notes, and online classroom materials, but you must work
independently and may not consult anyone (and confirm this with your submission). You
may take as much time as you wish, provided you turn in your quiz no later than 11:59 PM
(US Eastern Time Zone) Wednesday, July 20, 2016. Show work/explanation. Answers without any work may earn little, if any, credit. You
may type or write your work in your copy of the quiz, or if you prefer, create a document
containing your work. Scanned work is acceptable also; a single file in pdf format is
preferred. In your document, be sure to include your name and the assertion of
independence of work (see top of the page). If you have any question, please post it in “Ask the Professor” discussion on LEO if the
answer to your question would also benefit others in class; otherwise, please contact me
privately via e-mail. 1. (8 pts) Showing your work, Find the median of the following data.
86 92 76 66 27 59 74 86 48 2. (18 pts) The mileages of 24 cars were compiled (in miles per gallons):
37 18 22 41 18 28 27 40 24 20 28 29 19 36 20 26 42 36 44 32 30 37 29 35 Summarize the data by constructing a frequency distribution and a relative frequency distribution,
using intervals shown below. (Fill in the table.) 1 Mileage (miles per gallon) Frequency Relative Frequency
(to the nearest thousandth) 14.5 – 19.5 19.5 – 24.5 24.5 – 29.5 29.5 – 34.5 34.5 – 39.5 39.5 – 44.5 Total 3. (12 points) In a consulting firm, in addition to its president, who is the chief executive
officer (CEO), two engineers, a scientist, and an administrative assistant are on the payroll; the
mean annual salary is $120,000. The CEO decides to expand the firm’s services to its clients and
hires a consultant and a scientist with the annual salaries of $100,000 and $80,000, respectively.
Showing your work determine what the mean annual salary for the expanded firm is. 2 4. (8 pts) Consider the following table and pie graph (pie chart) before answering the question.
Assume that the values in the given table are correct.
Major Number
of Seniors %
of Seniors Business
Computer Sci.
English
Biology
Psychology 633
194
236
134
40 33
10
12
7
2 Other majors 681 36 Total Number
of Seniors
1918 100 Which of the following best describes the most serious problem with the pie chart?
(no explanation required)
3. _______
A. The sizes of the pie wedges are incorrect because the business wedge is too large and the English
wedge is too small.
B. The numbers shown in the pie chart for the selected majors do not match the numbers in the %
column of the table for those selected majors.
C. The numbers in the pie chart should be followed by “%” because the values are percentages.
D. The sizes of all the pie wedges are incorrect because an additional wedge must be included. 3 5. (32 pts) The number of calories per hot dog was determined for 10 brands of poultry hot
dogs. The data are
177 101 157 102 138 152 104 91 104 164 (a) Find the median. Show some work/explanation. Do not forget the unit. (b) State the mode(s) with unit(s).
(c) Compute the sample mean, the sample variance, and the sample standard deviation.
Use the table below to help organize your work. Fill in the table. xi xi x xi x 2 177
101
157
102
138
152
104
91
104
164 Total: xi Total:
_____ x x Total:
_____ i x x
i 2 ______ Mean = _____________
Sample Variance = ________________
Standard Deviation = _______________
(d) What percentage of the data fall within one standard deviation of the mean? Show work/explanation. 4 5 6. (22 pts) At a university, the probability that a student brings a laptop computer (laptop) to
classes is 0.65. Five students from that university are selected at random. (Report answers
rounded to four decimal places. Show work.) (a) What is the probability that exactly two of the five students bring laptops to classes?
Show work. (b) What is the probability that none of the five students brings a laptop to classes?
Show some work/explanation. (c) What is the probability that at most one of the five the students bring laptops to classes?
Show some work/explanation. (d) What is the probability that at least one of the five students brings a laptop to classes?
Show some work/explanation. 6

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