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一个初二的数学计算题,但是有些麻烦.

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一个初二的数学计算题,但是有些麻烦.
1、求 0.001,0.002,0.002,0.003,0.001,0.002,0.004的方差
2、求0.002,0.003,0.001,0.001,0.002,0.001,0.001,0.001,0的方差
每题有10个数据
一个初二的数学计算题,但是有些麻烦.
1)1.65*10的-6次
2)7.6*10的-7次