Question

The mean of 10 numbers is 14. Three of the numbers have a mean of 4. The remaining seven numbers are 15 18, 21, 5, m, 34 and 14. Find (i) the sum of the remaining seven numbers, (ii) the value of m

Answer 1

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

`\begin{gathered} 15+18+21+5+34+14 \\ 15+18=33+21=54+5=59+34=93+14=107 \end{gathered}`
`\begin{gathered} 3*4=12 \\ 12+107=119 \\ 140-119=21 \\ m=21 \\ 10*14=140 \end{gathered}`
`15+18+21+21+5+34+14=128`