In a study of 205 adults, the mean heart rate was 75 beats per minute. assume the population of heart rates is known to be approximately normal with a standard deviation of 8 beats per minute. what is the 95% confidence interval for the mean beats per minute?

a. 73.9 − 76.1
b. 73.7 − 76.1
c. 73.9 − 76.3
d. 70.9 − 73.3

73.9-76.1

Step-by-step explanation:

Given :

To Find: What is the 95% confidence interval for the mean beats per minute?

Solution:

Formula :

z = 1.96 at  95% confidence interval

Substitute the values in the formula:

Hence the 95% confidence interval for the mean beats per minute is 73.9-76.1

Thus Option A is true.

(x+3)(x+7)

step-by-step explanation: