A survey of the mean number of cents off that coupons give was conducted by randomly surveying one coupon per page from the coup
on sections of a recent San Jose Mercury News. The following data were collected: 20% 75c; 50c; 65c; 300; 55 40C; 40C; 30C; 55, $1.50; 400; 65; 40C. Assume the underlying distribution is approximately normal. a. b. c. d. Define the random variables X and X in words. Which distribution should you use for this problem? Explain your choice. Construct a 95% confidence interval for the population mean worth of coupons. i. State the confidence interval
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Let
n-------> the number of nickels
q------> the number of quarters
we know that
so
----> equation A
----> equation B
substitute equation B in equation A
Find the value of q
therefore
<u>The answer part a) is</u>
the number of nickels are and the number of quarters are
<u>the answer Part b) is</u>
The expressions that represents the number of quarters is