For some value of Z, the probability that a standard normal variable is below Z is 0.2090. The value of Z is:

-0.81

Explanation:

A standard normal random variable simply refers to the normally distributed random variable which has a imean of 0 and also had a standard deviation that has the value of 1.

The standard normal variable can also be represented by the letter Z. For some value of Z, the probability that a standard normal variable is below Z is 0.2090. The value of Z is -0.81.

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