求助一道PREP上的数学题，相同类型碰到好几次了

手冢 · 发表于 2012-10-30 17:33:09

a vending machine is desighed to dispese 8 ounces of coffee into a cup after tese that recorded the number of ounces of coffee in ach of 1000 cup dispense by vending machine the 12 listed amount in ounes were selected from data if the 1000 recorded amounts have a mean of 8.1 ounces and a standard deviation of 0.3 ounce how many of the 12 listed amounts are within 1.5 standard deviations of the mean.
7.51 8.22 7.86 8.36
8.09 7.83 8.30 8.01
7.73 8.25 7.96 8.53
求意思一直看不懂

beihorse · 发表于 2012-10-30 21:06:20

within 8.1 +/- 1.5 * .3

求助一道PREP上的数学题，相同类型碰到好几次了

所属分类: GMAT考试

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