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The length of a screw produced by a machine is normally distributed with a mean of 0.25 inches and a standard deviation of 0.01 inches. What percent of screws are between 0.24 and 0.26 inches?

68%
95%
99.7%
100%

Respuesta :

I believe the answer would be C. Cause the deviation is so small most nails would be between there. 
68% that is one standard deviation. Sigma +1 and sigma - 1

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