The mean is the sum of all numbers divided by the number of numbers. We can set up an equation:
Where 'x' is the next quiz score she need. Solve for 'x'. Multiply 5 to both sides:
Add:
Subtract 322 to both sides:
So her next quiz score needs to be 73 in order to have a mean score of 79 on all her quizzes.
Where 'x' is the next quiz score she need. Solve for 'x'. Multiply 5 to both sides:
Add:
Subtract 322 to both sides:
So her next quiz score needs to be 73 in order to have a mean score of 79 on all her quizzes.