A windmill at an energy factory spun 4 times in its first fifteen seconds of operations and 5 times in the next fifteen seconds. The total number of times that the windmill spun during those thirty seconds is in which of the following ranges? O At least 9 O At least 9 O At least t 9 and less than 10 and less than 101/2 and less than 10²/ At least 10 and less than 10 O At least 10% and less than 11/

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