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andrew11 [14]
3 years ago
10

A random sample of 41 cars in the drive-thru of a popular fast food restaurant revealed an average bill of $19.55 per car. The p

opulation standard deviation is $6.33. Estimate the mean bill for all cars from the drive-thru with 97% confidence.
Mathematics
1 answer:
Rashid [163]3 years ago
8 0

Answer:

19.55\pm2.145

Step-by-step explanation:

We use the equation \bar x\pm z^*\sigma/\sqrt n, where \bar x=19.55, \sigma=6.33, n=41, and z^*=2.17. We obtain z^* from the z-score of a 0.97 confidence level.

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