50%
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1/2 or 0.5
There is a 50% chance that it will land on heads each toss. You need to clarify the question: do you mean what is the probability that it will land on heads at least once, exactly once, all five times?
The probability of a fair coin to land head is 1/2. Since for 4 flips it must land heads each time, the probability of 4 heads is 1/2 * 1/2 * 1/2 * 1/2 = 1/16.
Since it is a certainty that a coin must land on either heads or tails, the probability must be 1.
The probability of a coin landing on heads is 0.5. It does not matter which toss it is, and it does not matter what the toss history was.