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.
When you add something, you gain more of it. Therefore, it should be positive 2
2
Answer:
b = c(a - 6x )
Step-by-step explanation:
Given
6x +
= a ( subtract 6x from both sides )
= a - 6x ( multiply both sides by c to clear the fraction )
b = c(a - 6x)
Answer:
B
Step-by-step explanation:
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Answer: the answer is A
Step-by-step explanation: