The lifespan of a light bulb manufactured by a certain company is measured by a random variable X with the following probability density function, f(x) = { 0.02e^(-0.02x) x > 0, 0 otherwise }, where x denotes the life, in hours, of a randomly chosen bulb. What is the probability that the lifespan of the bulb is between 30 and 80 hours? (Round your answer to 4 decimal places.)