Empirical knowledge asserts that the IQ score X of people is normally distributed with mean defined to be =100 and standard deviation o = 15. (a) Which of the following random variables, follow the standard normal distribution N(0, 1)? X-15 (i) 100 X+ 15 (ii) X- 100 (izi) 100 15 100 X + 100 X+ 100 (iv) (vi) 15 225 225

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