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OpenStudy (anonymous):
The following table gives the scores of 30 students in a mathematics examination. Scores 90–99 80–89 70–79 60–69 50–59 Students 3 9 13 4 1 Find the mean and the standard deviation of the given data. Hint: Assume that all scores lying within a group interval take the middle value of that group. (Round your answers to two decimal places.) I got found the mean, how do i find the standard deviation?
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OpenStudy (anonymous):
adding all together and then divide by the amount of data
OpenStudy (anonymous):
I just got it, thanks!
OpenStudy (anonymous):
welcome
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