[計量] PP1-PS-Q121

看板GMAT (GMAT入學考試)作者 (米尼)時間17年前 (2007/11/16 16:01), 編輯推噓0(000)
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121.(E) 7.51 8.22 7.86 8.36 8.09 7.83 8.30 8.01 7.73 8.25 7.96 8.53 A vending machine is designed to dispense 8 ounces of coffee into a cup. After a test that recorded the number of ounces of coffee in each of 1,000 cups dispensed by the vending machine, the 12 listed amounts, in ounces, were selected from the data. If the 1,000 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? (A) Four (B) Six (C) Nine (D) Ten (E) Eleven 想請問ㄧ下這題應該怎麼解 謝謝~ -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 61.65.194.84
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文章代碼(AID): #17FKvQ-H (GMAT)