You are Here: Home >< Maths

Stats help - Binomial distribution? Watch

1. Suppose a probability that a certain experiment will be successful is .4 - and let X denote the number of successes that are obtained in 15 independent performances of the experiment.

a. What is E(X)?
b. What is the Var(X)?
Find Pr(6≤X≤9)?

2. (Original post by fdsa212)
Suppose a probability that a certain experiment will be successful is .4 - and let X denote the number of successes that are obtained in 15 independent performances of the experiment.

a. What is E(X)?
b. What is the Var(X)?
Find Pr(6≤X≤9)?

You expect us to do your work!

Why are you using Pr, surely you should use capital P.

Updated: May 9, 2012
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:
Today on TSR

Stuck for things to do this summer?

Come and get some inspiration.

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

Chat with other maths applicants