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Determine the mean and the standard deviation of the following frequency distribution.
Class
Frequency
20 up to 30
7
30 up to 40
12
40 up to 50
21
50 up to 60
18
60 up to 70
a group of researchers conducted an experiment to determine which vaccine is more effective for preventing getting the
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The probability that it is a camper with Canadian license plates is 0.09. What is the probability that a camper entering the Luray Caverns has Canadian license plates?
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