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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Three squares inches out of total area under frequency curve of 12 square inches falls below score of 68. If the curve is based upon a total of 80 cases, how many cases fall below score of 68?
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A random sample of n=12 of roses was chosen nad the length of roses measured resulting in these observations:
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