Question

Tania analyzed the relationship between student test scores and the number of hours studied. She calculated the trend line to be y = 6.8x + 60, where x is the number of hours studied and y is the score. Which closet is to the score for a student who studied 3 hours?

A 80
B 85
C 90
D 95

Answer 1

A: 80

Explanation:

As we know that the trend line is
`y=6.8x+60`, we can plug in x=3 in order to find out the estimated score for 3 hours of studying

`y=6.8x+60\\\\y=6.8(3)+60\\\\y=20.4+60\\\\y=80.4`

y=80.4 is closest to A: 80

Answer 2

Option A, 80

Explanation:

Trend line is given by y = 6.8x + 60

where x = number of hours she studied

y = score

Now we have to calculate the score for a student for studied for 3 hours.

y = 6.8 × 3 + 60

= 20.4 + 60

= 80.40

≈ 80

Option A will be the answer.