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You drop 12 balls off of a platform that is an unknown distance above the ground and measure the time it takes for the ball

You drop 12 balls off of a platform that is an unknown distance above the ground and measure the time it takes for the ball to fall to the ground. How far above the ground is the platform? Give a range for this answer that you can be 95% sure that the true distance lies within. Please assume that g = 9.80 m/s2.

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