If a population of puzzle solving times has a mean of 420 s and variance of 5,184, what two sample means enclose the central 95% of the distribution of means when sample size is 36?
a. [400.32, 439.68]
b. [396.48, 443.52]
c. [393.12, 446.88]
d. [258.72, 581.28]
Ans: B
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