From a random sample of 36 fish caught in a sample, the mean length  X and sample standard deviation (sd) were found to be 30 cm and 6 cm respectively. If at 95% confidence level z is 1.96, then the mean length of fish in this population is in the range :

Question

[A] 27 < X < 33

[B] 27.5 < X < 32.5

[C] 24 < X < 36

[D] 28.04 < X < 32

Answer & Explanation
Answer: 28.04 < X < 32

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