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13. If X is a normal random variable with mean p = 50 arid standard deviation o = 7, if Y = X -7 then standard deviation of Y is: * .. (1.5 Points) Oo 14 O O 7 14. When certainty is involved in a situation, its probability is equal to: * (1 Point) Between 0 and 1 Between -| and + 1 Google Chro +9 One po Zero we15. If X is a normal random variable having mean u, then EX - u) is equal to: * (1.5 Points) O Quartile deviation O Standard deviation Variance Mean deviation 16. The semi-inter quartile range for a standard normal random variable Z is: * (1.5 Points) 0.7979 0.7979 0 0.6745 0.6745 0