Question

brittany's first four quiz grades are 78 81 69 and 94 what would her next quiz score need to be in order to have a mean score of 79

Answer 1

she would need to get a 73 on her next quiz. if you add them all up and then divide the total by 5, her mean score is 79.

Answer 2

The mean is the sum of all numbers divided by the number of numbers. We can set up an equation:


`\sf(78+81+69+94+x)/(5)=79`

Where 'x' is the next quiz score she need. Solve for 'x'. Multiply 5 to both sides:


`\sf 78+81+69+94+x=395`

Add:


`\sf 322+x=395`

Subtract 322 to both sides:


`\boxed{\sf x=73}`

So her next quiz score needs to be 73 in order to have a mean score of 79 on all her quizzes.