# Question

A random variable X is exponentially distributed with an expected value of 25.

a. What is the rate parameter ƛ? What is the standard deviation of X?

b. Compute P(20 ≤ X ≤ 30) .

c. Compute P(15 ≤ X ≤ 35) .

a. What is the rate parameter ƛ? What is the standard deviation of X?

b. Compute P(20 ≤ X ≤ 30) .

c. Compute P(15 ≤ X ≤ 35) .

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