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The average age of public jeepneys plying in Metro Manila is 15 years. Assume that the standard deviation is 4 years. If a random sample

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The average age of public jeepneys plying in Metro Manila is 15 years. Assume that the standard deviation is 4 years. If a random sample of 64 public jeepneys is chosen. find the probability that the mean of jeepneys ages is: a. Between 12 to 19 years b. Over 13 years

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