You are Here: Home >< Maths

# S1 Poisson Distribution watch

1. So, I need a little bit of help on my homework for this one question.
Part (i) of the question asks me to determine the probability of [7, 10] which I worked out to be 0.4804.
But (ii) then asks me: Hence calculate the probability that, on each of three consecutive days, Candice will receive a total of at least 7 but at most 10 phone calls and emails.
I wasn't quite sure how to approach this one and I was wondering if anyone would be able to explain to me?
2. (Original post by Saira_98)
So, I need a little bit of help on my homework for this one question.
Part (i) of the question asks me to determine the probability of [7, 10] which I worked out to be 0.4804.
But (ii) then asks me: Hence calculate the probability that, on each of three consecutive days, Candice will receive a total of at least 7 but at most 10 phone calls and emails.
I wasn't quite sure how to approach this one and I was wondering if anyone would be able to explain to me?
How is this Poisson? Using [7, 10] means an interval over the reals, not the integers. Also, what's the mean of the poisson distribution? You need to tell us this information in the future.

In this case, the answer is straightfroward. Part (ii) is asking you for the probability of (7-10) on the first day, (7-10) on the second day and (7-10) on the third day. The probability of this is the probability of (7-10) occurring multiplied by the probability of (7-10) occurring multiplied by (7-10) occurring. Think probability tree. i.e: your answer to part (i) cubed.
3. (Original post by Zacken)
How is this Poisson? Using [7, 10] means an interval over the reals, not the integers. Also, what's the mean of the poisson distribution? You need to tell us this information in the future.

In this case, the answer is straightfroward. Part (ii) is asking you for the probability of (7-10) on the first day, (7-10) on the second day and (7-10) on the third day. The probability of this is the probability of (7-10) occurring multiplied by the probability of (7-10) occurring multiplied by (7-10) occurring. Think probability tree. i.e: your answer to part (i) cubed.
Sorry. Should have thought.
4. (Original post by Saira_98)
Sorry. Should have thought.
It's fine. As long as you do it in the future.

Do you understand my answer, though?
5. (Original post by Zacken)
It's fine. As long as you do it in the future.

Do you understand my answer, though?
Yeah
6. (Original post by Saira_98)
Yeah
Awesome.
7. (Original post by Saira_98)
So, I need a little bit of help on my homework for this one question.
Part (i) of the question asks me to determine the probability of [7, 10] which I worked out to be 0.4804.
But (ii) then asks me: Hence calculate the probability that, on each of three consecutive days, Candice will receive a total of at least 7 but at most 10 phone calls and emails.
I wasn't quite sure how to approach this one and I was wondering if anyone would be able to explain to me?
think simpler, poisson is S2
8. (Original post by Apolexian)
think simpler, poisson is S2
WJEC put Poisson in S1 for us
9. (Original post by Saira_98)
WJEC put Poisson in S1 for us
Thats savage

### Related university courses

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: March 6, 2016
Today on TSR

### He lied about his age

Thought he was 19... really he's 14

### University open days

Wed, 25 Jul '18
2. University of Buckingham
Wed, 25 Jul '18
3. Bournemouth University
Wed, 1 Aug '18
Poll
Useful resources

### Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams