You are Here: Home >< Maths

# S1 question watch

The part about 4 batches being slescted. The answer to P(X=3) is 0.0853 and P(Xgreater or equal to) is 0.718 Thanks.
2. Let Y=no. of batches that contain at least one second. So Y=0,1,2,3,4.
Since prob(a batch contains at least one second)= 0.718 then Y~B(4, 0.718).
So you want P(Y<3).

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 6, 2011
Today on TSR

### Uni league tables

Do they actually matter?

### University open days

• University of Exeter
Wed, 24 Oct '18
Wed, 24 Oct '18
• Northumbria University
Wed, 24 Oct '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