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pls answer 3. . A sample of 50 students is randomly selected and their grades are normally distributed. the average grades of these students is

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3. . A sample of 50 students is randomly selected and their grades are normally distributed. the average grades of these students is 60 and the standard deviation is 4, calculate the number of students whose grades fall in this range ( 68, 52 ) * (1 Point)

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