21. A sample of 438 observations is randomly selected from a population. The mean of the
sample is 382 and the standard deviation is 14. Based on Chebyshev’s inequality, the
endpoints of the interval that must contain at least 88.89% of the observations are closest
to:
A. 340 and 424.
B. 354 and 410.
C. 396 and 480.
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