You are Here: Home >< Maths

# s2 normal distribution HELP watch

1. The random variable x has a normal distribution. The mean μ (where μ>0) and the variance 1/4μ^2.

(a) Find p(X>1.5μ)

I am having trouble with this question so far I have got...

P(z>2/μ)
2. anyone?
3. (Original post by Butterflyshy)
The random variable x has a normal distribution. The mean μ (where μ>0) and the variance 1/4μ^2.

(a) Find p(X>1.5μ)

I am having trouble with this question so far I have got...

P(z>2/μ)
You divided by the variance, rather than the s.d.
4. (Original post by ghostwalker)
You divided by the variance, rather than the s.d.
I now get p(z>1), 1-p(z<1) which is 1-0.8413 which is 0.1587 which is the answer. Thanks for your help

### 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: November 11, 2017
The home of Results and Clearing

### 1,071

people online now

### 1,567,000

students helped last year
Today on TSR

### University open days

1. Bournemouth University
Wed, 22 Aug '18
2. University of Buckingham
Thu, 23 Aug '18
3. University of Glasgow
Tue, 28 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