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In a study of 250 adults, the mean heart rate was 70 beats per minute. Assume the population of heart rates is known to be approximately normal with a standard deviation of 12 beats per minute. What is the 99% confidence interval for the mean beats per minute?

68.9 − 76.3
70 − 72
61.2 − 72.8
68 − 72

User Koldar
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Hello,
Please, see the attached file.
Thanks.
In a study of 250 adults, the mean heart rate was 70 beats per minute. Assume the-example-1
User Watts Epherson
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