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If the sample mean of some data is 175 and the sample standard deviation is 15...

If the sample mean of some data is 175 and the sample standard deviation is 15 then the z-score of the data value 149 is considered as which of the following
(a) an unusual score
(b) a very unusual score
(c) none of these
(d) a usual score

math   Statistics-And-Probability   
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