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Well, first i will have to make an apology for putting the question in this forum, but was not really sure where else i could put it. :)

The assignment is:

The number of oil tankers, arriving at a certain refinery on one day, follow a poisson distribution with the parameter µ=2. The present harbor facilities can serve 3 oil tankers a day. If more than 3 oil tankers arrive on a given day, the additional tankers (in excess of 3) are sent to another refinery.

Q1. What is the probability that oil tankers are sent to other refineries?

Q2. By how much should the capacity of the refinery harbor be extended, if it is desired that on a given day the probability of sending away arriving oil tankers does not exceed 0,05? 0,01?

Q3. What is the expected number of oil tankers arriving on a given day?

Q4. What is the most probable number of oil tankers arriving on a given day?

Q5. What is the expected number of oil tankers served on a given day?

Q6. What is the expected number of oil tankers sent on to other refineries on a given day?

I have made Q1+Q2 and got the answers : Q1 = 0,142877 Q2 = 2 and 3

But i cant work out how the last questions should be calculated?

We have got some leads though,

3. How many oil tankers can one expect to arrive on one day?

4. Which outcome has (or have) the highest probability?

5. Construct a random variable Y: Numbers of oil tankers served on one day; state the outcomes {0,1,2,3} and the probabilities associated.

6. Construct a random variable S: Numbers of oil tankers sent on to other refineries on one day; state the outcomes {4,5,…} and the probabilities associated – or apply “Laws of expected value”

Can someone help me ?

The assignment is:

The number of oil tankers, arriving at a certain refinery on one day, follow a poisson distribution with the parameter µ=2. The present harbor facilities can serve 3 oil tankers a day. If more than 3 oil tankers arrive on a given day, the additional tankers (in excess of 3) are sent to another refinery.

Q1. What is the probability that oil tankers are sent to other refineries?

Q2. By how much should the capacity of the refinery harbor be extended, if it is desired that on a given day the probability of sending away arriving oil tankers does not exceed 0,05? 0,01?

Q3. What is the expected number of oil tankers arriving on a given day?

Q4. What is the most probable number of oil tankers arriving on a given day?

Q5. What is the expected number of oil tankers served on a given day?

Q6. What is the expected number of oil tankers sent on to other refineries on a given day?

I have made Q1+Q2 and got the answers : Q1 = 0,142877 Q2 = 2 and 3

But i cant work out how the last questions should be calculated?

We have got some leads though,

3. How many oil tankers can one expect to arrive on one day?

4. Which outcome has (or have) the highest probability?

5. Construct a random variable Y: Numbers of oil tankers served on one day; state the outcomes {0,1,2,3} and the probabilities associated.

6. Construct a random variable S: Numbers of oil tankers sent on to other refineries on one day; state the outcomes {4,5,…} and the probabilities associated – or apply “Laws of expected value”

Can someone help me ?

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