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4. The time required for Speedy Auto to complete an oil change is normally distributed with population mean = 25 minutes with population standard deviation

4. The time required for Speedy Auto to complete an oil change is normally distributed with population mean = 25 minutes with population standard deviation = 3 minutes. A sample size n = 36 oil changes is taken. What is the probability that the sample mean is between = 23.5 minutes to 26.5 minutes?

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