The mean of 10 readings of a variable was 8.7 with standard deviation 0.3. A further 5
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The mean of 10 readings of a variable was 8.7 with standard deviation 0.3. A further 5 readings were taken: 8.6, 8.5, 8.8, 8.7, and 8.9. Estimate the mean and standard deviation of the set of possible readings using all the data available.
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