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

9. For some positive value of X, the probability that a standard normal variable 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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