z = 0.5
area to the left = 0.6915
z = 1.5
area to the left = 0.5596
0.6915 - 0.5596
= 0.1319
= 13.19%
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z = 0.5
area to the left = 0.6915
z = 1.5
area to the left = 0.5596
0.6915 - 0.5596
= 0.1319
= 13.19%