Question

Work out the mean of these five expressions :
3n-2,4n,2n+1,n-6,5n-3

Work out the mean of these five expressions :
2n+4,3n-6,4n+1,n-9,7

Answer 1

Have you considered adding them and dividing by 5?

Answer 2

But how do i add them when there is n which is unknown @tkhunny

Answer 3

Example: 3n + 5n = 8n. Add up all of the terms. You don't need a value for n to do that.

Answer 4

Oh okay thank you @mathmale

Answer 5

n is just a number. Sometimes it matters what number it is. Oftentimes, it doesn't matter. Just go with it.

Answer 6

I still don't understand what do i do @zenmo

Answer 7

Examples:
The average of 3 and 5. ==> (3 + 5)/2 = 8/2 = 4
The average of n and 3n. ==> (n + 3n)/2 = 4n/2 = 2n
The average of z and 2z and 6z. ==> (z + 2z + 6z)/3 = 9z/3 = 3z
The average of 1, 2, 4, 5. ==> (1+2+4+5)/4 = 12/4 = 3

Calculating an average is ALWAYS:
1) Add up your elements
2) Divide that sum by the total number of elements.