The yield at a given coal mine, in tons of ore per day, is approximately normally distributed with mean 785 tons and unknown standard deviation. a. Find the standard deviation of the daily output if it is known that on 13% of the days the output falls below 717.2 tons. b. Find the 68th percentile of the daily outputs. c. Find the probability that at least 700 tons of ore will be mined on a given day.

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