Simple question, difficult answer. It depends on how many times you want the penny to land on heads. The probability of a penny landing on heads once is 1 in 2. For it to land on heads twice is 1 in 4, for three times it is 1 in 8, and so on and so forth.
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1/2 * 1/2 = 1/4 1/2= probability of landing an even number 1/2 = probability of landing a heads
1 in 2, or 0.5
Theoretical probability is the number of ways something can occur divided by the total number of outcomes. So, the theoretical probability of throwing a coin and it landing on heads is 1/2 or 0.5 or 50%.
25%
1/2 for penny and 1/6 for dice