Can someone help me how to answer the following questions:
1) The life in years of an integrated circuit follows an exponential distribution with mean 7. For ten such circuits operating independently what is the probability that at least two will be working after 8 years?
2) The number of computer failures in a large company has a Poisson distribution, mean 0.40 failures per month. What is the probability that at least 10 minutes will elapse before the next vehicle?