'X' can have any value, from negative infinity to positive infinity.
As far as you've told us in the question, there's no connection
between 'x' and the coins.
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1 in 4
The probability of getting all tails when you flip 4 fair coins 1 time is:P(4 tails) = (1/2)4 = 1/16 = 0.0625 = 6.25%
Well, you have 24 possibilities, and you can get heads 6 ways, so it is 1/4.
You are in Australia - maybe - and have 4 coins of 50 cents each.
The probability is 2/4 or 4/8 or 1/2. The reason is that if you have 4 identical coins and you flip all of them at once you have half a chance because you could either get all heads, all tails, or a combination.