Answer:
The expected earnings of the attendant for this particular period are: $12.66
Step-by-step explanation:
We have to calculate expected mean here:
So,
E(x) = ∑x*f(x)
Therefore, the expected earnings of the attendant for this particular period are: $12.66 ..
Answer:
x^2 - 16x +60
Step-by-step explanation:
X^2 -17x + 70 + x -10
x^2 -17x + x +70 - 10
=
Answer:
4845 ways
Step-by-step explanation:
To solve this problem we use the formula of combinations
Where n is the total number of students that can be chosen and you choose r from them.
So
Note that in this case the order in which the 4 students are chosen does not matter.
Then
Answer:
solution is
Step-by-step explanation:
f(x)=2|x+6|-4
either x+6 is positive and then |x+6|=x+6
or it is negative and |x+6| = -(x+6)=-x-6
case 1: x>=-6
f(x)= 2x+12-4=2x+8
f(x)=6 <=> 2x+8=6 <=> 2x = 6-8=-2 <=> x = -1
case 2: x<=-6
f(x)=-2x-12-4=-2x-16
f(x)=6 <=> -2x-16=6 <=> 2x=-16-6 = -22 <=> x = -11
so to recap, the solutions are x=-1 and x=-11