GRE

简答题 The weights of a certain sort of insect arenormally distributed，with a mean of 35 grams and astandard deviation of lo grams．Approximately whatpercentage of these insects weigh between 25 and 45 9rams?

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D．
According to theempirical rule．approximately 68%of a normally distributedpopulation will be within one standard deviation of the mean．In this case，the weights that are within lograms of 35 grams are all of those from 25 up t0 45．

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