Answer:
X 1 2 3 4 5 6
P(X) 0.115 a 0.422 0.312 0.034 0.015
If we want a probability distribution we need to satisfy two important conditions:
1) 
2) 
And using the second condition we have this:

With a the probability associated with the value of X=2 and solving for a we got:

So then for this case 
Step-by-step explanation:
Let X the random variable that represent the number of classes that a student takes
For this case we have the following probability distribution given:
X 1 2 3 4 5 6
P(X) 0.115 a 0.422 0.312 0.034 0.015
If we want a probability distribution we need to satisfy two important conditions:
1) 
2) 
And using the second condition we have this:

With a the probability associated with the value of X=2 and solving for a we got:

So then for this case 
Answer:
For an 8-ounce salad would cost $1.52
Step-by-step explanation:
Every ounce would cost $0.19.
So you would multiply the cost with how much you would buy.
0.19(cost per ounce)×8(how much ounce)=1.52(total pay)
Answer:
3, 9
Step-by-step explanation:
In mathematics, a constant term is a term in an algebraic expression that has a value that is constant or cannot change, because it does not contain any modifiable variables.