求SAT达人解答一数学问题the arithmetic mea and standard deviation of a certain normal distribution are 15.5 and 3.0,respectively.what value is exactly 1.5 standard deviations less than the mean?先告诉我问的是什么 看了半天都晕

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求SAT达人解答一数学问题the arithmetic mea and standard deviation of a certain normal distribution are 15.5 and 3.0,respectively.what value is exactly 1.5 standard deviations less than the mean?先告诉我问的是什么  看了半天都晕

求SAT达人解答一数学问题the arithmetic mea and standard deviation of a certain normal distribution are 15.5 and 3.0,respectively.what value is exactly 1.5 standard deviations less than the mean?先告诉我问的是什么 看了半天都晕
求SAT达人解答一数学问题
the arithmetic mea and standard deviation of a certain normal distribution are 15.5 and 3.0,respectively.what value is exactly 1.5 standard deviations less than the mean?先告诉我问的是什么 看了半天都晕了 在简单讲解一下过程
真的是SAT啊 还是1的 这是我看了半天最难的一题 高2学的都忘得差不多了。。 囧

求SAT达人解答一数学问题the arithmetic mea and standard deviation of a certain normal distribution are 15.5 and 3.0,respectively.what value is exactly 1.5 standard deviations less than the mean?先告诉我问的是什么 看了半天都晕
我在GOOGLE上查出来的做题方法就是:
mean:平均值
sd:标准差
因为题目里问的是mean-1.5倍sd的值是多少.
所以结果是:
15.5-(1.5*3.0)=11.0
P.S:不知道答案对不对?楼主给个回复?
如果是对的,那这道题挺白痴的

虽然我看得懂是什么意思,不过不会做唉。真的像一楼所说,SAT不应该这么难啊。肯定不是1的,是不是SAT2 LEVEL2的?

这是sat吗?哪有这么难,连正态分布都考,他说 算数平均数(即均值&期望)是15.5,标准差是3,求1.5倍标准差的位置,这题ap都没有那么难,我认为应该是先转化为Z分布,然后根据6倍方差原则做的,~