T2 PS 126

[chiungfen]

126. 12631-!-item-!-187;#058&009380
9.4 9.9 9.9 9.9 10.0 10.2 10.2 10.5
The mean and the standard deviation of the 8 numbers shown are 10.0 and 0.3, respectively. What percent of the 8 numbers are within 1 standard deviation of the mean?

常搞不定 標準差和中位數的算法
(A) 90%
(B) 85%
(C) 80%
(D) 75%
(E) 70%

ANS :D

[Huang Hsin-Yi]

126. 12631-!-item-!-187;#058&009380
9.4 9.9 9.9 9.9 10.0 10.2 10.2 10.5
The mean and the standard deviation of the 8 numbers shown are 10.0 and 0.3, respectively. What percent of the 8 numbers are within 1 standard deviation of the mean?

在一個標準差之內就是
10-0.3<number<10+0.3

然後看看那些數在這個範圍內就好

常搞不定 標準差和中位數的算法
(A) 90%
(B) 85%
(C) 80%
(D) 75%
(E) 70%

ANS :D

[chiungfen]

THANKS~~~最近比較忙…SO 晚點回覆