It’s -3 repeating and there is the work your welcome child
Answer:
Expectation is equal to 4.75
Variance is equal to 3.02
Step-by-step explanation:
Consider the attached image.
Let denotes each of the outcome.
Expectation = ∑
∑
Variance
The total number of student can be solve by dividing the
partial student by its percentage of the overall student. Since there are 180
students in the band and it represnts 9% of the total students of the scool. So
the number of studetns are 180/0.09 = 2000 students
X - y = 1....multiply by -5
5x - 4y = 0
---------------
-5x + 5y = -5 (result of multiplying by -5)
5x - 4y = 0
---------------add
y = -5
x - y = 1
x - (-5) = 1
x + 5 = 1
x = 1 - 5
x = -4
solution is (-4,-5)