A teacher wanted to see if there was a relationship between the number of absences (x) a student had in her class and the final grade (y) of the student. The y-intercept for the line of best fit was found to be 96.8 and the slope of the line was found to be -2.67. What would be the predicted final numerical grade (rounded to the nearest whole number) for a student who missed 10 classes?
a. 65
b. 70
c. 75
d. 81
e. 86
f. 91
or is it none of these?
2007-04-19 14:51:20 · 5 answers · asked by Doug 2 in Science & Mathematics ➔ Mathematics
misses*slope+y-intercept=grade
10(-2.67)+96.8= -26.7+96.8 =70.1
it could be b
2007-04-19 14:57:15 · answer #1 · answered by chems 2 · 1⤊ 0⤋
You start by writing the equation with the information you have.
The y intercept is the value of y when x=0 and the slope is
-2.67 so we have:
y = 96.8 - 2.67x
y= 96.8 - 2.67 (10)
y= 96.8 -26.7
y= 70.1 or 70
answer is b.
2007-04-19 14:59:04 · answer #2 · answered by mc 2 · 1⤊ 0⤋
The predicted final grade is 96.8-(10*2.67)=70.1, so b is the correct answer.
2007-04-19 15:02:33 · answer #3 · answered by zee_prime 6 · 1⤊ 0⤋
96.8 - 10 * 2.67 = 96.8 - 26.7 â 70. So, b
2007-04-19 14:57:34 · answer #4 · answered by Anonymous · 1⤊ 0⤋
96.8 + 10(-2.67) = 96.8 - 26.7 = 70.1
Answer b.
2007-04-19 15:01:21 · answer #5 · answered by Steve A 7 · 1⤊ 0⤋