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Let the mean=18 and the standard deviation o = 1.5 if x= 12 then the standard score (z - score) of x = Select one:

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Let the mean=18 and the standard deviation o = 1.5 if x= 12 then the standard score (z - score) of x = Select one: a. -0.25 b. 0.25 C. 4 d.-4 A suitable number of classes for a data of size 41 is Select one: a. none b. 6.4 C. 6 d. 7

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