maths mc

👨🏻‍🏫 學術台數學

Terence yau

2007-10-29 12:07 am

if the range of 2,3,y,6,4,4,5,7 is 10 and y >0 , find the standard deviation

A 2.37

B 2.51

C 2.61

D 2.91

l want to step...
thx...

回答 (2)

用戶195274

2007-10-29 12:30 am

✔ 最佳答案

Range = 10
y - 2 = 10
y = 12
Mean = (2+3+12+6+4+4+5+7)/8 = 5.375
Standard deviation = sqrt{[2-5.375)^2 + (3-5.375)^2 + ... + (7-5.375)^2]/8} = 2.91

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用戶213779

2007-10-29 12:14 am

D 2.91

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