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A random sample of 40 families has an average water consumption of 29 cubic meters per month, with a sample standard deviation of 8 cubic meters. Give the 90% confidence interval for the mean usage of water per month.
Correct answer:
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Would you like to compute the count of combinations?
You need to know the following knowledge to solve this word math problem:
- statistics
- mean
- normal distribution
- combinatorics
- probability
- arithmetic
- square root
- basic functions
- percentages
Units of physical quantities:
Grade of the word problem:
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