Answer:
And we know that each time that we win we recieve $1 and each time we loss we need to pay $1, so then the expected value would be given by:
And the variance is defined as:
Step-by-step explanation:
For this case we know that we can win if we select 2 balls of the same color, so we can find the probability of win like this:
So then the probability of no win would be given by the complement:
We can define the random variable X who represent the amount of money that we can win.
And we can use the definition of expected value given by:
And we know that each time that we win we recieve $1 and each time we loss we need to pay $1, so then the expected value would be given by:
We can calculate the second monet like this:
And the variance is defined as:
Answer:
D (6, 21)
Step-by-step explanation:
Since the ratio of the corresponding values of x and y given in the table is 2 : 7
So, 6/ 21 = 2/7 = 2: 7
Thus, D (6, 21) is the correct answer.
Answer: D
Step-by-step explanation: a reflection across the line x=-1
Answer:
11/14
Step-by-step explanation:
We need to get a common denominator of 14
3/7 *2/2 = 6/14
5/14 already has a denominator of 14
6/14+5/14 = 11/14
Answer:
15%
Step-by-step explanation:
To find the percent increase, use the equation:
percent of increase=<u>amount of increase</u>
original amount
The amount of increase is 92-80 = 12. The original amount of 80; this gives us
12/80 = 0.15 = 15%