A and d is the one I would pick
The confidence interval for the mean usage of water is (18.7,20.5).
Given population standard deviation of 2.4, mean of 19.5 gallons per day and confidence interval of 98%.
We have to find the confidence interval for the mean usage of water.
To find out the confidence interval we have to first find margin of error.
μ=19.5
σ=2.4
α=0.98
α/2=0.49
We have to find the z value for the p value 0.49 which is z=2.33
Margin of error=z*μ/
=2.33*19.5/
=0.82
lower level=mean -m
=19.5-0.82
=18.68
after rounding upto 1 decimal
=18.7
upper mean = mean+m
=19.5+0.82
=20.52
Hence the confidence interval for the usage of water is (18.7,20.52).
Learn more about margin of error at brainly.com/question/10218601
#SPJ4
Answer:
n=8
Step-by-step explanation:
n/2+3=7
-3 -3
n/2 = 4
*2 *2
n=8
Help plz asap....Jovie's boss tells her to make 6
inch ribbon curls. If she makes
60 ribbon curls per hour, how
many hours would it take her to
make 480 ribbon curls? Write an
equation and then solve.