Question: Women's pulse rates are normally distributed with a mean of 66.5 beats per minute and a standard deviation of 12.4 beats per minute. What is

Women's pulse rates are normally distributed with a mean of 66.5 beats per minute and a standard deviation of 12.4 beats per minute. What is the z-score for a woman having a pulse rate of 63 beats per minute?

Student's incorrect answer:

Let z =(x-)/

z =((66.5 - 63))/(12.4)

z = 0.282

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