某人估计其家庭九月份的电费(元)由下式决定:X=28.5+0.6C,其中C是九月份温度,它是均值为34.2、标准差为2.2的连续型随机变量。求该家庭九月份的平均电费以及电费的标准差。
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I suspect that we are always faintly conscious of the fact that this is a smallish island, with the sea always round the corner.()
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