x Turn on thread page Beta
 You are Here: Home >< Maths

# Statistics 2 - Normal as approx to Poisson watch

1. Accidents occur in a factory at an average rate of 5 per month. Find the probability that there will be exactly 62 in a year.

I don't understand how to structure the working out for when it equals something as opposed to greater/less than or equal to, help please??
2. (Original post by timsiu98)
Accidents occur in a factory at an average rate of 5 per month. Find the probability that there will be exactly 62 in a year.

I don't understand how to structure the working out for when it equals something as opposed to greater/less than or equal to, help please??
P(less than/equal to 62) - P(less than/equal to 61)?
3. (Original post by chumps52)
P(less than/equal to 62) - P(less than/equal to 61)?
but for normal distribution aren't I supposed to include 62.5 and 61.5 or something, I just tried it with 62 and 61 and its not right according to the answer in the back of the book
4. (Original post by timsiu98)
but for normal distribution aren't I supposed to include 62.5 and 61.5 or something, I just tried it with 62 and 61 and its not right according to the answer in the back of the book
Have you tried repeating the above but with those two values then? I need to revise stats...
5. (Original post by chumps52)
Have you tried repeating the above but with those two values then? I need to revise stats...
Yeah I have tried that but I think I'm missing something lool not sure what though
6. http://www.cos.edu/faculty/georgew/tutorial/Pois15.GIF

I would just use that formula and put the number of successes as 62 and the mean as 60 (per year) but given how much I suck at Statistics as is evident from my numerous posts here, that could be a shocking abuse of the formula and a wholly incorrect answer. But that is what I'd do presently.
7. (Original post by djpailo)
http://www.cos.edu/faculty/georgew/tutorial/Pois15.GIF

I would just use that formula and put the number of successes as 62 and the mean as 60 (per year) but given how much I suck at Statistics as is evident from my numerous posts here, that could be a shocking abuse of the formula and a wholly incorrect answer. But that is what I'd do presently.
comes up as a maths error cos the number is too big for the calculator haha, I'll just leave it for my teacher I guess.. a long wait, thanks anyways

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: October 26, 2015
Today on TSR

### Loughborough better than Cambridge

Loughborough at number one

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