Find the z-score for which 99% of the distribution’s area lies between -z and z.
This would mean that the area from the left would be (1 - 0.99)/2 = 0.005. The only value of z which works in this case is -2.575, so z = 2.575 and -z = -2.575.
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This would mean that the area from the left would be (1 - 0.99)/2 = 0.005. The only value of z which works in this case is -2.575, so z = 2.575 and -z = -2.575.