, 03.08.2020 14:01 iyana479

# At a factory that produces pistons for cars, Machine 1 produced 459 satisfactory pistons and 51 unsatisfactory pistons today. Machine 2 produced 360 satisfactory pistons and 40 unsatisfactory pistons today. Suppose that one piston from Machine 1 and one piston from Machine 2 are chosen at random fromtoday's batch. What is the probability that the piston chosen from Machine 1 is unsatisfactory and the piston chosen from Machine 2 is satisfactory?​

### Another question on Mathematics

Mathematics, 21.06.2019 17:00
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An engineer has designed a new light bulb to last longer than the old light bulbs her company makes now. the old light bulbs have a mean lifetime of 1200 hours. she is planning a hypothesis test to determine whether bulbs of her new design actually last longer than the bulbs of the old design. what is the null hypothesis for this study? h0: μ< 1200 h0: μ≠1200 h0: μ=1200 h0: μ> 1200 what is the alternative hypothesis for this study? ha: μ< 1200 ha: μ≠1200 ha: μ=1200 ha: μ> 1200