Here is dependence between scores and x-values:

where
is the mean,
is standard deviation and i changes from 1 to 2.
1. When i=1,
then

2. When i=2,
then

Now solve the system of equations:


Subtract first equation from the second:

Then

Answer: the mean is 62, the standard deviation is 20.
Answer:
y = -2x + 150
Step-by-step explanation:
y2 - y1 / x2 - x1
120 - 100 / 15 - 25
20 / -10
= -2
y = -2x + b
100 = -2(25) + b
100 = -50 + b
150 = b
Answer: 3
Step-by-step explanation:
Find slope of that line which is -1/3x-4
then flip its sign and the equation to get 3
Part A - 14 sections of fencing
Part B - 0.9165 the distance between each stake
Answer:
1. SQ and VX
2. RT and UW
Step-by-step explanation:
An Interior Angle is an angle inside a shape
Alternate exterior angles are the pair of angles that lie on the outer side of the two parallel lines but on either side of the transversal line.