[問題]GWD 18-18

[yvetteytseng]

A certain characteristic in a large population has a distribution that is symmetric about the mean m. If 68 percent of the distribution lies within one standard deviation d of the mean, what percent of the distribution is less than m + d ?

A. 16%
B. 32%
C. 48%
D. 84%
E. 92%
還是懷疑答案錯,這不是很明顯的答案A嘛?
可是答案是D
不知是否我誤解了,請多多指教,謝謝

[zazer.lin]

嗯...小弟算的結果也是跟yvetteytseng一樣...
算來算去都是答案(D) 84%

[yvetteytseng]

I think maybe the answer is wrong

[reohuang]

less than m + d

50%+34%=84%
答案應該是D沒錯喔

A的16%應該是題目不小心看錯或誤會題意

for your reference~

[bistro]

sorry, would you please explain why 50% ?

[zazer.lin]

A certain characteristic in a large population has a distribution that is symmetric about the mean m. If 68 percent of the distribution lies within one standard deviation d of the mean, what percent of the distribution is less than m + d ?

A. 16%
B. 32%
C. 48%
D. 84%
E. 92%

to bistro
就是因為 "a distribution that is symmetric about the mean m" 這句話, 所以可得知 m = 50%

[bistro]

oh~~ thank you so much, I just realize what a stupy question I made.
@_@...

[rola1225]

能否說明一下題目的意思，看不太懂　

[FionaV]

可以請解釋那34%是從那裡來的嗎?

[zazer.lin]

A certain characteristic in a large population has a distribution that is symmetric about the mean m. If 68 percent of the distribution lies within one standard deviation d of the mean, what percent of the distribution is less than m + d ?

A. 16%
B. 32%
C. 48%
D. 84%
E. 92%
還是懷疑答案錯,這不是很明顯的答案A嘛?
可是答案是D
不知是否我誤解了,請多多指教,謝謝

實在很抱歉...小弟在二樓回文看錯yvetteytseng大大所選的答案了...
答案是d沒錯

題目:
某個分配對稱於平均數m(意即平均數為 50%, 這樣才能使該分配對稱)
假如 68% 的分配落於平均數的一個標準差之內(意即 (m+d) - (m-d) = 68%)
問該分配有多少百分比少於 m+d

附上圖形...或許會清楚些...

[csc]

A certain characteristic in a large population has a distribution that is symmetric about the mean m. If 68 percent of the distribution lies within one standard deviation d of the mean, what percent of the distribution is less than m + d ?

A. 16%
B. 32%
C. 48%
D. 84%
E. 92%
還是懷疑答案錯,這不是很明顯的答案A嘛?
可是答案是D
不知是否我誤解了,請多多指教,謝謝

實在很抱歉...小弟在二樓回文看錯yvetteytseng大大所選的答案了...
答案是d沒錯

題目:
某個分配對稱於平均數m(意即平均數為 50%, 這樣才能使該分配對稱)
假如 68% 的分配落於平均數的一個標準差之內(意即 (m+d) - (m-d) = 68%)
問該分配有多少百分比少於 m+d

附上圖形...或許會清楚些...

zazer兄

你的解釋真的是非常清楚，感謝你，也為你鼓勵鼓勵