"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
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Author:Amos Gilat
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Can you PLEASE help me with number 74????

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
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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