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Find the variance and standard deviation for the following data:
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The relative humidity (in %) of a certain city for a month of 30 days was as follows:(i) Construct a grouped frequency distribution table with classes , etc.
(ii) Which month or season do you think this data is about?
(iii) What is the range of this data?
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Thirty women were examined in a hospital by a doctor and the number of heart beats per minute were recorded and summarized as follows. Find the mean heart beats per minute for these women, choosing a suitable method.
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| Question Text | Find the variance and standard deviation for the following data: |
