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?

Question

asked Apr 2, 2022 173k views

1 Answer

Christa · Answer 1 · 2022-04-08T16:42:58+0000

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

$x \approx 88$