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A study of amount of time it takes for a teacher to cover a specific chapter in a math class shows a normal distribution curve with the mean of 7.5 hours and standard deviation of 1.5 hours. If 16 teachers are randomly selected, find: A. The probability that their mean time will be between 7 and 8 hours B. The probability that their mean will be below 7 or above 8 hours C. The probability that their mean will be below 7 and above 8 hours.
Sagot :
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