The probability that a standard normal random variable, Z, is between 1.50 and 2.10 is the same as the probability Z is between -2.10 and -1.50.

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Quizplus · Accepted Answer

This is true because the standard normal distribution is symmetric around the mean of 0. Therefore, the probability of Z being between 1.50 and 2.10 on the right side of the distribution is the same as the probability of Z being between -2.10 and -1.50 on the left side of the distribution.

The Probability That a Standard Normal Random Variable, Z, Is