単純平均
(10.3+9.1+7.4+11.4+8.4+9.8+13.4)÷7=9.971%

加重平均
(10.3%×144分+9.1%×278分+7.4%×219分+11.4%×215分+8.4%×234分+9.8%×199+13.4%×203)÷(144+278+219+215+234+199+203)=9.866%