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3. The random variable X; is the waiting time (in seconds) for the elevator to arrive once the ith person push the button and

3. The random variable X; is the waiting time (in seconds) for the elevator to arrive once the ith person push the button and expected value of Xi is 20 and standard deviation is 8. Find the probability that the waiting time for 50 people is between 900 & 1100 seconds? (25 points)

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