# A random 2

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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### 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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