# Memory Refreshing

• November 7th 2010, 04:07 AM
Dinkydoe
Memory Refreshing
I've done these excercises before, but It's not really fresh in my memory anymore..

Suppose $X_1,\cdots, X_n$ independant normal distributed stochasts with $\mu=5,\sigma^2=10$

How do we find c such that $P(5-c\leq \overline{X}\leq 5+c)=0.6$
• November 7th 2010, 12:29 PM
mr fantastic
Quote:

Originally Posted by Dinkydoe
I've done these excercises before, but It's not really fresh in my memory anymore..

Suppose $X_1,\cdots, X_n$ independant normal distributed stochasts with $\mu=5,\sigma^2=10$

How do we find c such that $P(5-c\leq \overline{X}\leq 5+c)=0.6$

Start by getting the pdf for $\overline{X}$.