Do I know the answer? NO. Cause I don't know what it is asking for.
But this is no math question here... It (merely) says the probability of getting m >= n/2 is.. the sum of the individual trials at 0.25 success rate... so? what are we trying to solve for to get the Wifi?
Take a look at another riddle like this, in words "The probability of getting more than or equal to 3 in a dice roll is the probability of getting a 3, or a 4 or a 5, or a 6". Just what's the password then? You don't need to get wifi in this place. Go to another place.
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