A data center contains 1000 computer servers. Each server has probability 0.004 of failing on a given day What is the standard deviation of the number of servers that fail? Of the items manufactured by a certain process, 15% are defective. Of the defective items, 64% can be repaired. Find the probability that a randomly chosen item is defective and cannot be repaired. 0.054 Find the probability that exactly 2 of 20 randomly chosen items are defective and cannot be repaired