Question

Assuming the trend that exists in the data set below applies to all students, how long should Trevor study if

he want to get at least a 75% on the test?

Answer 1

He should study for at least 88 minutes

Explanation:

The missing parameters are:

`y = 0.36805x + 42.6864` --- equation of trend

`y \to grade`

`x \to time`

Required

x when
`y = 75`

`y = 0.36805x + 42.6864` becomes

`75 = 0.36805x + 42.6864`

Collect like terms

`0.36805x = 75 - 42.6864`

`0.36805x = 32.3136`

Solve for x

`x = (32.3136)/(0.36805)`

`x = 87.80`

`x \approx 88`