Question

.In a study of 225 adults, the mean heart rate was 72 beats per minute. Assume the population of heart rates is known to be approximately normal with a standard deviation of 10 beats per minute. What is the 90% confidence interval for the mean beats per minute?

70.7 – 73.3

70.9 – 73.1

70.7 – 73.1

70.9 – 73.3

Answer 1

@am!rah @zepdrix

Answer 2

@Compassionate