Step-by-step explanation:
hi I have answered ur question
Answer:
The best estimate of the number of times out of 39 that Ariana is on time to class is 27.
Step-by-step explanation:
For each class, there are only two possible outcomes. Either Ariana is on time, or she is not. The probability of Ariana being on time for a class is independent of other classes. So we use the binomial probability distribution to solve this question.
Binomial probability distribution
Probability of exactly x sucesses on n repeated trials, with p probability.
The expected value of the binomial distribution is:

The probability that Ariana is on time for a given class is 69 percent.
This means that 
If there are 39 classes during the semester, what is the best estimate of the number of times out of 39 that Ariana is on time to class
This is E(X) when n = 39. So

Rounding
The best estimate of the number of times out of 39 that Ariana is on time to class is 27.
Answer:
it would be 4
Step-by-step explanation:
One tenth is 0.1. One hundredth is 0.01. Therefore, one ten thousandth is 0.00001. The answer is 111.11111.
Answer: D. 20
Elliot is taking an exam with 4 questions and each question has 4 possible answers. If he answer it correctly, he will get 5 points for each correct answer.
If we assume that he gets all of the 4 questions correct,
4 * 5
=20 points