COMPLETE QUESTION:
Find some means. Suppose that X is a random variable with mean 30 and standard deviation 4. Also suppose that Y is a random variable with mean 50 and standard deviation 8. Find the mean of the random variable Z for each of the following cases. Be sure to show your work.
a) Z = 35-10X
b) Z = 12X-5
c) Z = X+Y
d) Z = X-Y
e) Z = 2X+2Y
Answer:
a) -265
b) 355
c) 80
d) -20
e) 40
Step-by-step explanation:
The attachment below contains the whole calculations that provides for the answers above
Here is how we get the equation that best represents the general form of the given expression above.
Since we have a fraction, what we are going to do in order to eliminate it is to multiply both sides by 2. So this gives us x^2 = 14x.
Move 14x, and the final form would be x^2 -14x = 0.
Hope this is the answer that you are looking for.
Answer:8:7
Step-by-step explanation:
16:14 divided by 2 = 8:7
Answer:
Simplifying
Result: 18x - 12y
Step-by-step explanation:
I believe you simplify the expression, by using -2, the number outside the bracket, to multiply with the numbers within the bracket.
-2 x -9x = 18x
-2 x 6y = -12y
Answer:
The number of cupcake did Mary has 20.83
The number of cupcake did Paul has 104.15
Step-by-step explanation:
The total cupcakes to eat altogether = 125
Let The number of cupcake did Mary has = x
So The number of cupcake did Paul has = 5× x
So, According to question
The number of cupcake did Paul has + The number of cupcake did Mary has = 5× x + x
Or . 5×x + x = 125
Or, 6 x = 125
∴ x = 
= 20.83
The number of cupcake did Mary has = 20.83
The number of cupcake did Paul has = 5×x =5 × 20.83 = 104.15
Hence The number of cupcake did Mary has 20.83
The number of cupcake did Paul has 104.15 Answer
