( 18 + 28 + 12 + x ) /4 = 15
58 + x = 60
x = 2
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check
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18+28+12+2 = 4*15 ?
60 = 60 sure enough
What is the missing number if the mean is 15?
18, 28, 12,
1 answer
18, 28, 12,
1 answer