The answer depends on whether or not the two variables are independent.
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This question can only be answered if the probability distribution functions of X1, X2 and X3 are known. They are not and so the question cannot be answered.
The probability of flipping one coin and getting tails is 1/2. In order to find the probability of multiple events occurring, you find the product of all the events. For 3 coins the probability of getting tails 3 times is 1/8 because .5 x .5 x .5 = .125 or 1/8.
how do i find the median of a continuous probability distribution
You multiply the probability by 100.
Read the introduction to probability and probability measures at StatLect.com