Find the values of z which cut off (a) the top 10% (b) the bottom 15% (c) the middle 50% of the standard Normal distribution.

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In the standard normal distribution, the mean is 0 and the z scores represent how many standard deviations away from the mean a certain value is. The area underneath the curve of the normal distribution has a total value of 1, so the area underneath any part of the curve represents a proportion. This information can be used to find the z scores that correspond to certain parts of the standard normal distribution. Without knowing any other...

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