Two alternative machines are being considered for a cost reduction project. Machine A has a first cost of $60,000 and a salvage value of $22,000 at the end of it 6 year service life. Annual operating costs of this machine and the associated probabilities are estimated as follows: Annual O&M Costs Probability $5,000 0.20 8,000 0.30 10,000 0.30 12,000 0.20 Machine B has a first cost of $35,000 and its salvage value at the end of it 4-year service life is negligible. Annual operating costs of this machine and the associated probabilities are estimated as follows: Annual O&M Costs Probability $8,000 0.10 10,000 0.30 12,000 0.40 14,000 0.20 The MARR on this project is 10%. The required service period is estimated to be 12 years. Assuming independence, calculate the mean and variance for the equivalent annual cost of operating each machine