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Q20. For some positive value of X , the probability that a standard normal variable Z is between 0 and 2 X is 0.1255. The

Q20. For some positive value of X, the probability that a standard normal variable Z is between 0 and 2X is 0.1255. The value of X is

a. 0.99

b. 0.40

c. 0.32

d. 0.16

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