7. The masses of plums from a certain orchard have mean 24g and standard deviation 4g. The plums are graded small, medium or large. All plums over 28g in mass are regarded as large and the rest equally divided between small and medium. Assuming a normal distribution find the upper limit of the masses of the plums in the small grade. (A) 22.557 (B) 23.196 (C) 24.054 (D) 18.227

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A:

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