1 The table below shows the probability distribution of past records of the number of breaks of a heavy-duty document scanning machine in a week. It is estimated that each breakdown costs the company $2,874 in lost business. Find the standard deviation of the weekly cost from the breakdowns of this machine, 0 1 2 3 4 No. of breaks (X) P(X) 0.11 0.2 0.16 0.45 0.08