What is the probability that she will score above 80 on exactly two of the four

What is the probability that she will score above 80

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1)What is the probability that she will score above 80% on exactly two of the four tests ? 2)What is the probability that she will score above 80% on exactly three of the four tests ? 3)What is the probability that she will score above 80% on at least three of the four tests ? 4)What is the probability that she will score below 80% on one of the four tests ? 5)What is the probability that she will score below 80% on at least one of the four tests ?
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