The mean weight of loads of coal placed in train cars by a loading machine is 43.0 tons with a ...

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The mean weight of loads of coal placed in train cars by a loading machine is 43.0 tons with a standard deviation of 8.0 tons. Assuming that the weight of loads placed in the train cars by this loader are normally distributed, if a random sample of 9 loads is chosen for a weight check, find the probability that the mean weight of those loads is more than 40.60 tons.
 
Place your answer, rounded to four decimal places, in the blank.