In a certain state, the daily amounts of industrial waste are normally distributed, with a mean of

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In a certain state, the daily amounts of industrial waste are normally distributed, with a mean of 8000 tons and a standard deviation of 2000 tons. Find the probability that on a randomly selected day the amount of industrial waste is
(a) Greater than 11,000 tons.
(b) Less than 6000 tons.
(c) Between 9000 and 11,000 tons.
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