that all depends on which facts you acknowledge as a priori state for this situation.
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the probability is 0.03125 or 3.123%
The probability of getting five tails in a row is 1/2^5, or 1 in 32.The probability of getting five heads in a row is 1/2^5, or 1 in 32.Thus, the probability of getting either five heads or five tails in five tosses is 1 in 16.(The caret symbol means "to the power of," as in 2^5 means "2 to the 5th power.")
There are 2,598,960 5-card hands. This is combinatorials, which is used in probability but is not probability itself.
Probability of girl, assumed to be 0.5. Therefore, probability of 5 girls is 0.5^5 or 0.03125.
The probability will depend on how much you know and the extent of guessing.