Answer:
4 of each
Step-by-step explanation:
1.50 x 4 =6
.50 x 4 =2
he bought 4 folders and 4
Answer:
88 cars
Step-by-step explanation:
8x-3x=5x
40 cars = 5x
divide both sides by 5
x=8 cars
8x+3x=11x
11x=88 cars altogether
Answer:
More boys than girls
Step-by-step explanation:
Answer:c
Step-by-step explanation:
Answer:
Step-by-step explanation:
For this case we have the following distributions given:
The expected value for x is
And the variance
The expected value for x is
And the variance
We define a new random variable:
We need to find the expectd value and the variance for W.
For the expected value we have this:
And if we replace the parameters we got:
Now foe tha variance of W we know that X and Y are indpenendet variable so then
For this case we can use the property that is a is a constant and X a random variable then , and we got this:
And if we replace we got: