Answer: D. About 0.09 milligrams
Step-by-step explanation:
I took the quiz and got it right!
Answer:
Step-by-step explanation:
Note that the quadratic formula has that "plus or minus" due to our taking the square root of some quantity. No square root is involved in the two formulas you've posed.
I have two suggestions here:
1) Write " (x plus or minus y)^2 = x^ plus or minus 2 times xy + y^2 " Note that a + on the left side corresponds to a + on the right side, and same with - .
2) Memorize these two formulas, which in most algebra textbooks you'll find in the section "special products and factoring."
X+2y=1
2y =1-x
y= (1-x)/2
5x-4y= -23
By substituting the value of y in this equation
5x -4 {(1-2)/2} = -23
5x- 2 +2x = -23
7x= -21
x= -3
Now, let's find the value of y bu putting the value in any othe two equations
I'll use x +2y=1
-3 +2y=1
2y =4
y=2
So, the value of x and y is -3 and 2 respectively.
Answer:
a) P=0.2
b) P=0.42
c) P=0.7
d) Marginal probability distribution of x:

Marginal probability distribution of y:

e) The two variables are dependant.
Step-by-step explanation:
The joint pmf of X and Y appears in the accompanying tabulation (attached).
a) Is the proability that one hose being used in the self service island and one hose being use in the full service island.

(according to the tabulation)
b)

c) This event means that at least one hose is in use in each of the island.
d)
Marginal probability distribution of x:

Marginal probability distribution of y:

Compute P(X≤1)

e) For X and Y to be independent variables, the following conditions must be true:
- P(x|y) = P(x), for all values of X and Y.
- P(x ∩ y) = P(x) * P(y), for all values of X and Y.
We evaluate the second probability for X=1 and Y=1.

This condition is not satisfied, so the two variables are dependant.
Answer:
4.5
Step-by-step explanation:
8 + 7 + 6 + 5 + 4 + 3 + 2 + 1/8
36/8
=4.5