A stack of coins has 10 nickels. Only one of the nickels is “heads.” What is the probability that the fifth coin from the bottom is “tails”?


The probability of an event happening is defined in math as:
P = Number of ways it can happen/Total number of possible outcomes
The probability that the only coin in the stack of 10 coins with “heads” will appear on any location in the stack is expressed as:
P = 1/10
Since there is only 1/10 probability that a coin located anywhere in the stack will be “heads,” there is a 9/10 probability that a coin is “tails.” It means that, it will be 9/10 likelier that the 5th coin from the bottom (or anywhere from the stack, for that matter) will be tails.

Visit our website for other GED topics now!