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York University
MATH 1131(FALL 2011): Introduction to Statistics
Midterm Examination – Wed, Oct 26, 2011, 7:00 p.m.–7:50 p.m.
Last Name:
Given Names:
Student Number:
Signature :
DO NOT WRITE IN THIS AREA
Read the following instructions carefully
1. Students are allowed to bring:
a.
One 1sided
8.5”x11” formula sheet (only formulas are allowed and
no deﬁnitions nor examples) Put your name on the
formula sheet as we will collect the formula sheet with
your test papers. b. Calculator(s) (cannot use laptop,
cell phone or ipad as calculator)
2. All work must be done in the free space provided be
low for each problem or on the back of the
preceding
page
.
3. No other sheets of paper will be accepted or marked.
4. This exam consists of 11 pages in total. Last 4 pages
contain Binomial Distribution Cumulative Probabili
ties tables and Standard Normal Cumulative Proba
bilities tables.
Question
Max Score
Your Score
1
15
2
10
3
10
4
10
5
10
TOTAL
55
1
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View Full DocumentQuestion 1:
(15 marks)
a. The following stemandleaf plot shows the waiting time (in minutes) of several cus
tomers before they were served at the checkout counter.
Leaf Unit = 0.1
0
48
1
134688
2
023457899
3
12456778899
4
00123334455567789
5
011223445667888
6
1123334556778
7
0223445789
8
013466
9
0127
10
017
11
25
12
79
i.
(1 mark)
Describe the shape of the stemandleaf plot.
SOLUTION:
positively skewed (or skewed with a long right tail)
ii.
(5 marks)
Report the ﬁvenumber summary.
SOLUTION:
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 Fall '10
 Wong
 Statistics

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