A researcher records a large sample of data with a mean equal to 36 and a standard deviation equal to 1.5. If the data are normally distributed, then using the empirical rule which of the following gives the closest estimate for the percentage of data that falls between scores 33 and 39.
A. at least 68%
B. at least 95%
C. at least 99.7%
D. at least 100%
Ans: B
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