find the area under the curve and between z=0.64 and z=2.23
P(0.64<z<2.23) = P(z<2.23) – P(z<0.64)
P(z<2.23) = 0.9871
P(z<0.64) = 0.2611
P(0.64<z<2.23) = 0.9871 – 0.2611 = 0.726
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