D 20 units
I know this because 7+7=14 and 3+3=6. Then 6+14=20.
Answer:
z= -55 / 5-y
the line is a divided by sign you put 55 on top and the 5-y on bottom
Answer:
b and a i think
Step-by-step explanation:
Answer:
look at picture
Step-by-step explanation:
x: adult tickets
y: student tickets
Using the binomial distribution, it is found that there is a 0.857 = 85.7% probability that at least 2 of the rolls come up as a 3 or a 4.
For each die, there are only two possible outcomes, either a 3 or a 4 is rolled, or it is not. The result of a roll is independent of any other roll, hence, the <em>binomial distribution</em> is used to solve this question.
Binomial probability distribution
The parameters are:
- x is the number of successes.
- n is the number of trials.
- p is the probability of a success on a single trial.
In this problem:
- There are 9 rolls, hence
.
- Of the six sides, 2 are 3 or 4, hence

The desired probability is:

In which:

Then



Then:


0.857 = 85.7% probability that at least 2 of the rolls come up as a 3 or a 4.
For more on the binomial distribution, you can check brainly.com/question/24863377