We calculate average by adding up all the data and dividing it by the total number of entries.
Start off by first making an equation like so:
[tex] \frac{246+288+234+276+X}{5} [/tex] = 255, where X = the earnings for the fifth week.
Now multiply both sides by the denominator (5) to get this:
246+288+234+276+X = 1,275
Add up all the known earnings so far:
1,044 + X = 1,275
Subtract the total earnings so far from both sides:
X = 231
Answer: 231
