Given that X̄=20, σ=9 and n=81, construct the following confidence intervals: the 95% confidence interval for μ is:  a (18.04, 21.96) b (17.68, 22.47) c (18.40, 23.48) d (18.67, 22.87)

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Given that X̄=20, σ=9 and n=81, construct the following confidence intervals:

the 95% confidence interval for μ is: 

a (18.04, 21.96)
b (17.68, 22.47)
c (18.40, 23.48)
d (18.67, 22.87)
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