What does "a bag weighing within 5% of the mean" mean in the paragraph as below?
题目
What does "a bag weighing within 5% of the mean" mean in the paragraph as below?
The weight of a bags of flour has a mean of 5 pounds with a standard deviation of 0.16 of a pound.Given the weight is normal distributed,what is the probability of a bag weighing within 5% of the mean?
答案
一包面粉的平均重量是5pound（偏差0.16/pound）,这里考虑重量是正态分布,一包面粉重量在平均值的5%之内的概率是多少?
举一反三
已知函数f（x）=x，g（x）=alnx，a∈R．若曲线y=f（x）与曲线y=g（x）相交，且在交点处有相同的切线，求a的值和该切线方程．
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