2 standard deviation(sd)是2倍sd的意思嗎,可以這樣省略比較級?
2 standard deviation(sd)是2倍sd的意思嗎,可以這樣省略比較級?
A list of numbers has a mean of a standard deviation of 2.5.If x is a number in the list that is 2 standard deviations above the mean,what is the value of
這是新GRE官方指南上149頁的一道題啊,不好意思,開頭是...has a means of 8 and a standard deviation...
A list of numbers has a mean of a standard deviation of 2.5.If x is a number in the list that is 2 standard deviations above the mean,what is the value of
這是新GRE官方指南上149頁的一道題啊,不好意思,開頭是...has a means of 8 and a standard deviation...
英語人氣:914 ℃時間:2020-04-06 07:14:05
優(yōu)質(zhì)解答
我正好做到這道題,看了老半天終于明白了:有一組數(shù)字平均數(shù)是8,標準差是2.5.如果x是這組數(shù)字中的一個,并且比平均數(shù)大兩個標準差那么多,x的值是多少.其實不好理解的就是那個“2 standard deviations above the mean”,就是比8大兩個2.5嘛……x==8+2.5x2=13……
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