1. During a 3-week period, two identical machines have the following record of downtime (inminutes) for repairs:

machine	Week 1	Week2	Week 3
1	45, 18, 30	32, 55,20,15,12	22,38,19,15
2	136,98	166,124,56	98,107

a. Which machine is better in terms of maintainability?

b. Which is better in terms of other criteria? Explain "other" criteria.