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求數據0.1、0.2、0.3、0.4、0.5的平均數與方差用兩種方法
求數據0.1、0.2、0.3、0.4、0.5的平均數與方差用兩種方法
平均數:(0.1+0.2+0.3+0.4+0.5)/5=(1/10+2/10+3/10+4/10+5/10)/5=15/10 X 1/5=3/10=0.3方差:(0.1-0.3)²;+(0.2-0.3)²;+(0.3-0.3)²;+(0.4-0.3)²;+(0.5-0.3)²;=0.1兩者相比方差越小…
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