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# Answer on Statistics and Probability Question for Dion

Question #17337
A random sample of 50 four-year olds attending day care centers provided a yearly tuition average of $3,987 and the population standard deviation of$630. Find the 90% confidence interval of the true mean.
x-bar = 3648
standard error = E = 1.645 * [630/sqrt(50)]= 146.56
CI: x-bar - E &lt; mu &lt; x-bar + E
3501.44 &lt; mu &lt; 3794.56

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