Given,
X_bar = 525
s = 25
n = 100
Now calculate 99% confidence interval is
CI = x_bar
z*(s/
n)
z value for 99% confidence interval is 2.576.
CI = 525
2.576*(25/
100)
= 525
6.44
CI = 525 - 6.44 and CI = 525 + 6.44
= 518.26 and CI = 531.44
Therefore 99% confidence interval is (518.26,531.44).
Option (b) is correct.
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