如规定平时、期中、期末计分比例为3:3:4,某生平时成绩为80分,期中为90分,期末为78分,则该生总平均分为多少?
解:X(上面有横线)=∑Wi•Xi/∑Wi=(3×80+3×90+4×78)/(3+3+4)=82.2该生的总平均分为82.2分。
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