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

# Statistics S1 question driving me wild! watch

1. I have been struggling with this question for the past 20 minutes for some reason. I bet the answer is going to be so simple , can you help?

Question: Joe Sleepwell misses lectures by oversleeping. Probability that he oversleeps is 0.6. Find the probability that in e ten week term with two lectures a week, he misses more than half of them.

Any help would be appreciated.
2. (Original post by wavey93)
I have been struggling with this question for the past 20 minutes for some reason. I bet the answer is going to be so simple , can you help?

Question: Joe Sleepwell misses lectures by oversleeping. Probability that he oversleeps is 0.6. Find the probability that in e ten week term with two lectures a week, he misses more than half of them.

Any help would be appreciated.
There are 20 lectures in total. You just need to use the binomial distribution with n=20 and p=0.6 to find P(X>10).
3. Assuming that each lecture is independent (i.e. if two lectures were on the same day then they wouldn't be independent) then you can model the number of missed lectures by a binomial distribution. The value of p would be 0.6 and n would be 2*10=20, the total number of lectures.

You would need to get your required probability using cumulative binomial tables.
4. 0.8725
5. (Original post by Phil_Waite)
There are 20 lectures in total. You just need to use the binomial distribution with n=20 and p=0.6 to find P(X>10).
thank you so much!

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: April 3, 2011
Today on TSR

### Been caught plagiarising...

...for the 2nd time this year

### Mum says she'll curse me if I don't go to uni

Discussions on TSR

• Latest
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

## Groups associated with this forum:

View associated groups
Discussions on TSR

• Latest

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE