Given the following question:
The mean of 10 numbers is 14
m = 14
The mean of three of those 10 numbers is 4
m = 4
The remaining seven are 15, 18, 21, 5, m, 34, and 14
Three of the numbers has a mean of 4
[tex]\begin{gathered} 15+18+21+5+34+14 \\ 15+18=33+21=54+5=59+34=93+14=107 \end{gathered}[/tex][tex]\begin{gathered} 3\times4=12 \\ 12+107=119 \\ 140-119=21 \\ m=21 \\ 10\times14=140 \end{gathered}[/tex][tex]15+18+21+21+5+34+14=128[/tex]