determine the standard deviation temperature.

MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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I know what the answer is to this question (per the textbook) but I'm not sure how to solve the second part of the question:  determine the standard deviation temperature.  Also, the first part of the question, I calculate 70.28 as the mean but the answer is 70.6.  How should I have rounded that?

Household Winter
Temperature Often,
frequency distributions are
reported using unequal class
widths because the
frequencies of some groups
would otherwise be small or
very large. Consider the
following data, which represent
the daytime household
temperature the thermostat is
set to when someone is home
for a random sample of 750
households. Determine
the class midpoint, if
necessary, for each class and
approximate the mean and
standard deviation
temperature.
Source: Based on data from the U.S. Department of Energy
Frequency Midpoint - xi
31
Temperature (°F)(°F)
61-64
65-67
68-69
xi fi
62.5000
1937.50000
67
66.0000
4422.00000
198
195
68.5000
13563.00000
70
71-72
70.0000
13650.00000
120
71.5000
8580.00000
89
50
73-76
74.5000
6630.50000
77-80
78.5000
3925.00000
750
52708.00000
Mean
70.28
| |유
Transcribed Image Text:Household Winter Temperature Often, frequency distributions are reported using unequal class widths because the frequencies of some groups would otherwise be small or very large. Consider the following data, which represent the daytime household temperature the thermostat is set to when someone is home for a random sample of 750 households. Determine the class midpoint, if necessary, for each class and approximate the mean and standard deviation temperature. Source: Based on data from the U.S. Department of Energy Frequency Midpoint - xi 31 Temperature (°F)(°F) 61-64 65-67 68-69 xi fi 62.5000 1937.50000 67 66.0000 4422.00000 198 195 68.5000 13563.00000 70 71-72 70.0000 13650.00000 120 71.5000 8580.00000 89 50 73-76 74.5000 6630.50000 77-80 78.5000 3925.00000 750 52708.00000 Mean 70.28 | |유
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