Question: 4. There are four jars: J1, J2, J3, J4. Each jar has some red balls and some blue balls. In jar J1, 80% of the

4. There are four jars: J1, J2, J3, J4. Each jar has some red balls and some blue balls. In jar J1, 80% of the balls are blue. In jar J2, 60% of the balls are blue. In jar J3, 40% of the balls are blue. In jar J4, 20% of the balls are blue. A blindfolded person asked to pick a ball from one of these jars randomly. The ball turns out to be red. a. What is the probability that the red ball came from jar J1? b. What is the probability that the red ball did not come from jar J4

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