The following table shows the probability distribution of the number of successful repairs made by a computer technician over a T week period Number of u ccessful Wee klvr Repairs {x} Determine the expectation of successful repairs for the next few weeks. :1 What is the variance? :1 What is the standard deviation? :1 What is the probability that there will he at least 20 or more successful repairs in a given week? :1