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Mathematics
Senior High
奶油泡芙
奶油泡芙

想問2

【類題28】:甲、乙、丙三班,人數甲班40人,乙班30人,丙班30人;算術平均數甲班80 乙班 75,丙班85;標準差甲班8,乙班6,丙班 11,合併甲、乙、丙班後,求 100人的: (1)算術平均數為 (2)標準差為 80 9.4 11258560 169830 2250 226380 648770 18825 85
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