Question

Mallory wants to run an average of 4 miles per day during the week (Monday

through Friday). Use the table below to find the number of miles x she needs to
run on Friday so that the mean number of miles ran per day is 4. PLEASE HELP

Answer 1

The average must be 4 miles, so:

`(4 + 4.5 + 0 + 2.5 + x)/(5) = 4`

`4 + 4.5 + 0 + 2.5 + x= 4\cdot 5`

`11 + x= 20`

`x = 20 - 11`

`x = 9`