Probability is such an innate part of your life that you rarely think about it. However, every time you use a word like “might,” “may,” “undoubtedly,” “without fail,” or “maybe,” you are voicing a probability that an event will occur.
Scientists and mathematicians like to express probability more accurately. For example, if you toss a penny in the air, the probability (P) that it will land heads can be expressed:
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