生物統計學請教 - 考試

By Eden
at 2013-05-10T17:57
at 2013-05-10T17:57
Table of Contents
題目:
搭乘飛機的乘客, 平均體重為65公斤, 標準差為20公斤。
有一飛機的載重限制為4500公斤,若載滿64名乘客, 其超過飛機負荷的機率為多少?
我的疑問:主要的癥結點在於新變異數的數值
我自己的解法:
因為新的平均數乘上64, 故新的標準差也應該乘上64
則新的變異數=64^2*20^2
----------------------------------
老師的解法:
新的變異數= 64*20^2
----------------------------------
而其他類似的題型,在變異數上面老師都是使用同樣的算法
但是變異數=標準差的平方
所以是我的想法哪邊有錯誤嗎?
謝謝幫忙解答的大大~
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考試
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