Variance and standard deviation
Given the following frequency distribution, find the mean, variance, and standard deviation. Please show all of your work.
Class Frequency
51-53 9
54-56 19
57-59 16
60-62 24
63-65 25
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A frequency curve is constructed from test scores of 200 students. Sixty percent of total area under the curve falls between test scores of 25 and 45. How many students have scores between 25 and 45?
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