Answer:
The combined standard deviation is 1.58114.
Step-by-step explanation:
The formula to compute the combined standard deviations of two different data sets is:
Here 
is the combined mean given by:
It is provided that the sample size is same for both the data sets, i.e.
Compute the combined mean as follows:
Compute the combined standard deviation as follows:
Thus, the combined standard deviation is 1.58114.
3/99 = 1/33
So 3 ÷ 99 = 1/33 = 0.030303030303, or 33%
C=25x+75 would be the equation
Step-by-step explanation:
75 dollars is the flat out fee right away and the 25 is for how many hours spent fixing the drain
Step-by-step explanation:
okay I think you can solve this question now ☺️
Linear combination method just means to add the equations so that one variable with cancel. In this case the a values are already set up so that they will cancel.
2a + 3b = 1
-2a + b = 11
4b = 12
b = 3
now put 3 back into either of the original equations and solve for a.
2a + 3(3) = 1
2a + 9 = 1
2a = -8
a = -4
(-4,3)
