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the population of 1500 construction truck has a load distributed normally with the mean of 6 tons and the standard

deviation of 1 ton.

1) if one of these trucks is randomly selected, find the probability that its load is greater then 7 ton.

2)if 49 different truck are randomly selected, find the probability that a truck load is greater then 7ton.

3)if 100 different truck are randomly selected, find the probability that a truck load is greater then 7ton.

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