Thread: Exponential Distribution

Hi

The following question i don't understand why my answer is incorrect.
X is an exponential rc, with mean 2. What is the Pr(X < 2.5)?
My answer is
- e^( )

and x = 2.5

so - e^(-2*2.5)

P.S

Originally Posted by Paymemoney

Hi

The following question i don't understand why my answer is incorrect.
X is an exponential rc, with mean 2. What is the Pr(X < 2.5)?
My answer is
- e^( ) That should be minus lambda

and x = 2.5

so - e^(-2*2.5)

P.S

The mean is , so if the mean is 2, then lambda is...