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I'm working through a statistics problem set and I'm stuck on grouped data. I have a frequency table with class intervals and their frequencies, but I'm not sure how to find the standard deviation from that instead of raw data points. Could someone walk me through the steps, including how to find th…
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I'm working through a statistics problem set and I'm stuck on grouped data. I have a frequency table with class intervals and their frequencies, but I'm not sure how to find the standard deviation from that instead of raw data points. Could someone walk me through the steps, including how to find the midpoint of each class and where that fits into the formula? An example with numbers would help a lot.
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