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You want the area under the normal curve between z1 = (36-36.2)/3.7 and z2 = (37.5-36.2)/3.7

Using half tail tables (which give the probability (area under the normal curve) between the mean and z - the number of standard deviations from the mean of the value, negative just means it's to the left of the mean):

z1 = (36 - 36.2) / 3.7 ≈ -0.0541

z2 = (37.5 - 36.2) / 3.7 ≈0.3514

→ area between -0.0541 and 0.3515 standard deviations from the mean

= 0.0199 + 0.1368

= 0.1567

= 15.67 %

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