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Mean dikurangi nilai eka:
Mean=((40*65)-80)/39
=((2600-80)/39)
=2520/39
=64,6
7) mean 20 anak=7,5
Mean setelah masuk t = 7,4
7,4*21=(20*7,5)+t
155,4=150+t
Nilai t=155,4-150=5,4