50=2800+640a/60+12a find the value of a
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Mean = sum of fixi / sum of fi
60 = (2800+640a)/(60+12a)
3600 + 720a = 2800 + 640a
720a - 640a = 2800 - 3600
80a = -800
a = -800/80
a = -10
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