Two valleys are sometimes infected with ee rot. Suppose valley 1 is infected with robability 45%, valley 2 is infected with robability 60%, and the probability that at east one is infected is 85%. Suppose tree rot observed in valley 2. What is the probabil- y that valley 1 is also infected? Your answer hould be a percentage (without the percent ign).

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Q: In a group of 55 examinees taking the 50-item test, Rachel obtained a score of 38. This implies that…

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Q: A sample of n = 5 scores has a mean of M = 12. If one person with a score of X = 8 is added to the…

A: Given n = 5 mean = 12