The lengths of telephone calls can be modeled by an exponential distribution with parameter = 0.3

Question:

The lengths of telephone calls can be modeled by an exponential with parameter λ = 0.3 per minute, with the call lengths being independent. What is the probability that out of 10 telephone calls, 2 will be shorter than 1 minute, 4 will last between 1 minute and 3 minutes, and the other 4 will last longer than 3 minutes?
Distribution
The word "distribution" has several meanings in the financial world, most of them pertaining to the payment of assets from a fund, account, or individual security to an investor or beneficiary. Retirement account distributions are among the most...