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Hi, i'm david and i'm here to help you answer your question.
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Now let me bring up your question here.
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In this question, we're going to discuss about the standard normal distribution.
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Here, once you find the probability of the z, it will be between the 1 .5 and the 2 .5.
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To find this probability, let me try to draw the graph on the normal for you.
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Now, the standard normal has the mean under 0.
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Suppose this one will be the 1 .5, this will be the 2 .5.
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And the probability is equal to the area of the shaded region here.
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If you find this shaded region, notice that if we consider the minus 2 .5 and the minus 1 .5 on the left.
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And therefore we see the shaded on the left one here will be the same thing on the right because of the symmetry...