Persons taking a 30-hour review course to prepare for a standardized exam average a score of 620 on that exam. Persons taking a
70-hour review course average a score of 785. Find a linear function which fits this data.
1 answer:
Answer:
y = 4.125x + 496.25
Step-by-step explanation:
Set the data up as points. Then deal with the points.
Givens
(30,620)
(70,785)
y2 = 785
y1 = 620
x2 = 70
x1 = 30
Formula
Slope = (y2 - y1) / (x2 - x1)
Solution
Slope = (785 - 620)/(70 - 30)
Slope = 165 / 40
Slope = 4.125
===================
Now you need the y intercept. Either one of the two given points will give you that.
y = 620
x = 30
m = 4.125
y = mx + b
620 = 4.125*30 + b
620 = 123.75 + b
620 - 123.75 + b
b = 496.25
You might be interested in
probability of you performing first is 1/13
after your team performs there are 12 teams left, so chance of the other team performing next is 1/12
chance of both happening = 1/13 * 1/12 = 1/156
22+26+28+30+39+44+62+63= 314
Divide the answer by the amount of numbers
=39.25
The answer is going to be A
Answer = 5.5 x 5.5 = 30.25