十月梦队数学讨论专帖，请NN多多支持！！

joice · 发表于 2003-9-18 11:16:00

I am wandering around and don't know which JJ to start with. Now i got some works to do in here.

283. I got 5 + 2* 6^(1/2). 2 < 6^(1/2)< 3. So D is correct.
295. i got 2.7 too.
300. No idea how to do it.
306. insufficient information.
316. ?

320. ?

bed time. good night.

[此贴子已经被作者于2003-9-18 12:14:17编辑过]

joice · 发表于 2003-9-18 12:08:00

以下是引用祈晴坊主在2003-9-18 11:41:00的发言：
283还是没想通(3^1/2+2^1/2)/(3^1/2-2^1/2)
你们怎么算的啊，还是我题目看错了啊

Yes, I finally figure out you missed '/'.

joice · 发表于 2003-9-19 08:58:00

300,316,320. Can NN explan them, please?

joice · 发表于 2003-9-20 08:22:00

deviation,
standard deviation.
variance.

[此贴子已经被作者于2003-9-20 8:23:47编辑过]

joice · 发表于 2003-9-25 21:48:00

hz, can i borrow your brain for a while? I pay deposit.

joice · 发表于 2003-9-26 21:18:00

祈晴坊主mm,
have you decided your test date yet?

joice · 发表于 2003-9-26 21:36:00

Happy birth day!!!

joice · 发表于 2003-9-26 21:40:00

I am thinking postpond to the end of OCT, because i am still in OG SC.

.
Can't you take the test in HanZhou? It looks you have school in Hanzhou.

Are you ready? You are a small hard-working bee.

joice · 发表于 2003-9-30 21:48:00

253). 正态分布，落在正负一个标准方差(d)内概率68％，问正两个d的概率。 68%+(1-68%)/2

I am not really understand the question. if the question is to find the probability when SD =+2, then i think the answer is wrong. Let me try :
in z score, 95.44% of the area is within 2 standard deviations,
1- .9544 = . 0456
.5 - .0456 = .4544
so the probability is 45.44%

Please let me know, if i did it wrong.

joice · 发表于 2003-9-30 22:52:00

If it is: 问正两个d的概率, 题目应该问M+d的数的概率?
问negative 两个d的概率, 是大于M-d的数的概率?

[此贴子已经被作者于2003-9-30 22:52:55编辑过]

十月梦队数学讨论专帖，请NN多多支持！！

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