Question 336931
To find the average of a set of numbers, you add the numbers and divide by how many numbers you added.
{{{(65+79+83+68+x)/5 = 70}}} x = the score Mark needs on his final to get an overall average of 70.
{{{(295+x)/5 = 70}}} Multiply both sides by 5.
{{{295+x = 350}}} Now subtract 295 from both sides.
{{{x = 55}}} This is the score that Mark needs on his final.