Environmental Studies Short Question | Gkseries

In a random sample of x516, the mean (X) is 40, and the standard deviation (sd) is 4.0. The 95% confidence interval (Z51.96) for the mean is :

[A] 64.0

[B] 61.96

[C] 60.25

[D] 60.30

Answer & Explanation
Answer: 61.96