"4. Automobiles traveling on a road with a posted speed limit of 55 miles per hour checked for speed by a state police radar system. Following is a frequency distributic speeds. Speed (miles per hour) Frequency 45-49 50-54 55-59 10 40 150 175 75 15 10 60-64 65-69 70-74 75-79 475
"4. Automobiles traveling on a road with a posted speed limit of 55 miles per hour checked for speed by a state police radar system. Following is a frequency distributic speeds. Speed (miles per hour) Frequency 45-49 50-54 55-59 10 40 150 175 75 15 10 60-64 65-69 70-74 75-79 475
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
Related questions
Question
Can you PLEASE help me with number 74????

Transcribed Image Text:Supplementary Exercises
159
73. The days to maturity for a sample of five money market funds are shown here. The dollar
amounts invested in the funds are provided. Use the weighted mean to determine the mean
number of days to maturity for dollars invested in these five money market funds.
Days to
Maturity
Dollar Value
(Smillions)
20
20
12
30
10
15
6.
10
74. Automobiles traveling on a road with a posted speed limit of 55 miles per hour are
checked for speed by a state police radar system. Following is a frequency distribution of
speeds.
Speed
(miles
per hour)
Frequency
45-49
10
50-54
40
55-59
150
60-64
175
65-69
75
70-74
75-79
15
10
Total
475
What is the mean speed of the automobiles traveling on this road?
b. Compute the variance and the standard deviation.
a.
75. The Panama Railroad Company was established in 1850 to construct a railroad across the
isthmus that would allow fast and easy access between the Atlantic and Pacific Oceans.
The following table (The Big Ditch, Mauer and Yu, 2011) provides annual returns for
Panama Railroad stock from 1853 through 1880.
Return on Panama Railroad
Year
Company Stock (%)
1853
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