Re: [計量] PP1-PS-Q121
※ 引述《minimumi (米尼)》之銘言：
: 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?
他問有多少數是落在1.5倍的S.D.裡
所以在 8.1+1.5*0.3=8.55 這個區間內
8.1-1.5*0.3=7.65
只有第一個7.51掉在這個區間外面
所以共有11個在那個區間內
: (A) Four
: (B) Six
: (C) Nine
: (D) Ten
: (E) Eleven
: 想請問ㄧ下這題應該怎麼解
: 謝謝~
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11/16 17:31, , 1F
11/16 17:31, 1F
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