The output of a gas furnace has large quantities of carbon dioxide, which must be monitored carefully. This table gives the percentage of CO2 in the output, with samples taken every 9 seconds.
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(a) Group these measurements into equal classes, and construct a frequency distribution table for the data. (Use a spreadsheet to help solve this problem.)
(b) Compute the mean, median, and mode of the data.
(c) Compute the standard deviation of the data.
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Under what flow conditions is the above model valid?
Assuming that the expression:
can be used to describe the speed-density relationship of a highway, determine the
capacity of the highway from the data below using regression analysis.
What will be an ideal response?
Two delicate devices are rated as shown in Fig. 2.142. Find the values of the resistors R? and R? needed to power the devices using a 36-V battery.
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What is a disadvantage of positive-pressure fans?
a. they can spread heat and smoke if used improperly b. they impede entry and exit of personnel c. favorable wind conditions are required for their use d. correct placement can be time consuming