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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?

1 Answer

4 votes

Answer:

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

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