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Mathematics 9 Online
OpenStudy (anonymous):

A gray-scale digital camera with 1,000,000 pixels takes a picture (the picture is made of 1,000,000 parts and each part has a certain amount of gray). A histogram is made where the data is the amount of gray in each of these parts. The histogram looks bell-shaped with a mean of 125 gray levels and a standard deviation of 15. How many pixels are brighter than 163 gray levels? 5000 10,000 160,000 50,000

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