Solution :
(a)
z = (x - ) / = (53 - 40) / 12 = 1.08
(b)
z = (68 - 40) / 12 = 2.33
(c)
z = (33 - 40) / 12 = -0.58
(d)
z = (9 - 40) / 12 = -2.58
Consider a sample with a mean equal to 40 and a standard deviation equal to 12....
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