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

Help plz

Answer 2

b

Answer 3

help did u get it

Answer 4

?

Answer 5

so u dont know and ur giving random answers

Answer 6

i do its b

Answer 7

How ?

Answer 8

im kinda helping someone else rn, but you can wait for someone else to answer if you dont believe me