STATISTICS,急求解答方法,Suppose that 175 out of a sample of 625 test tubes showed water pollution.Let X be a random variable which takes the values 0 for a non-polluted test tube and 1for a polluted test tube.Determine the sample mean,median an
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![STATISTICS,急求解答方法,Suppose that 175 out of a sample of 625 test tubes showed water pollution.Let X be a random variable which takes the values 0 for a non-polluted test tube and 1for a polluted test tube.Determine the sample mean,median an](/uploads/image/z/13478521-49-1.jpg?t=STATISTICS%2C%E6%80%A5%E6%B1%82%E8%A7%A3%E7%AD%94%E6%96%B9%E6%B3%95%2CSuppose+that+175+out+of+a+sample+of+625+test+tubes+showed+water+pollution.Let+X+be+a+random+variable+which+takes+the+values+0+for+a+non-polluted+test+tube+and+1for+a+polluted+test+tube.Determine+the+sample+mean%2Cmedian+an)
STATISTICS,急求解答方法,Suppose that 175 out of a sample of 625 test tubes showed water pollution.Let X be a random variable which takes the values 0 for a non-polluted test tube and 1for a polluted test tube.Determine the sample mean,median an
STATISTICS,急求解答方法,
Suppose that 175 out of a sample of 625 test tubes showed water pollution.Let X be a random variable which takes the values 0 for a non-polluted test tube and 1for a polluted test tube.Determine the sample mean,median and standard deviation
STATISTICS,急求解答方法,Suppose that 175 out of a sample of 625 test tubes showed water pollution.Let X be a random variable which takes the values 0 for a non-polluted test tube and 1for a polluted test tube.Determine the sample mean,median an
625试管中,共有175显示水污染.如让未知数X的值来代表样品,当试管是污染的时候,X = 0, 纯净的时候 X = 1. 计算X值的平均,中位数和标准差.
从题中可知数列中有 175个“0”, 450个“1”. 平均计算为 (450 + 0)/625 = 18/25 = 0.72
中位数计算是把全部的数从小到大排列,然后取中间的数,这个数列中有奇数个值,所以不用做平均,X = 1 的数量明显比 X = 0 多,所以MEDIAN为“1”.
标准差公式我忘了,楼主可以查一查.在EXCEL里面可以做 F(X) = STDEV, 或用图形计算器算.