设等差数列{an}的公差为d,则"a1,a2,a3,a4,a5,a6,a7的方差为1"的充要不得条件是d=
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![设等差数列{an}的公差为d,则](/uploads/image/z/3619032-24-2.jpg?t=%E8%AE%BE%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%7Ban%7D%E7%9A%84%E5%85%AC%E5%B7%AE%E4%B8%BAd%2C%E5%88%99%22a1%2Ca2%2Ca3%2Ca4%2Ca5%2Ca6%2Ca7%E7%9A%84%E6%96%B9%E5%B7%AE%E4%B8%BA1%22%E7%9A%84%E5%85%85%E8%A6%81%E4%B8%8D%E5%BE%97%E6%9D%A1%E4%BB%B6%E6%98%AFd%3D)
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设等差数列{an}的公差为d,则"a1,a2,a3,a4,a5,a6,a7的方差为1"的充要不得条件是d=
设等差数列{an}的公差为d,则"a1,a2,a3,a4,a5,a6,a7的方差为1"的充要不得条件是d=
设等差数列{an}的公差为d,则"a1,a2,a3,a4,a5,a6,a7的方差为1"的充要不得条件是d=
首先算这几个数的平均数,易得平均数就是a4.
然后跟据方差的计算公式
s=1/7[(a1-a4)^2+(a2-a4)^2+(a3-a4)^2+(a4-a4)^2+(a5-a4)^2+(a6-a4)^2+(a7-a4)^2]
1=4d^2
d=1/2
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