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?

answer:

(74.8905,75.1095)

step-by-step explanation:

given that in a study of 205 adults, the mean heart rate was 75 beats per minute.

sigma = population std deiation = 8

std error = 8/sqrt 205

=8/14.32

=0.559

margin of error = z crit *std error

z critical for 95% = 1.96

margin of error = 1.96(0.559)

=1.095

conf interval lower bound = mean -margin of error

=75-0.1095

=74.8905

upper bound = 75+0.1095 = 75.1095

the answer i believe is 27 units.

step-by-step explanation:

1350 hats

step-by-step explanation:

divide 900 by 2 to find 50% or half of 900

900/2=450

add 450 to 900

1350