The following are the marks obtained by a batch of 9 students in a certain test.68,50,32,21,54,38,59,66 and 44.Calculate the standard deviation.
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20, 33, 39,40, 50, 53, 59, 65, 69,
Here, n = 9 [odd]
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20, 33, 39,40, 50, 53, 59, 65, 69 [in this group]
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