The probabilities that we calculated last section are theoretical probabilities. In a perfect world, that's the exact chance of getting some outcome. This world is an imperfect place though, and what we actually get is not usually right on. We call those experimental probabilities. To calculate experimental probabilities, the top number is the number of times you got what you wanted, the bottom number is the total number of times you did the thing (rolled the dice, flipped the coin etc). The experimental probability can be used to generalize to a different group number as well using cross multiplying.
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Probability is the chance that some even will occur. It will be a fraction, decimal and/or percent representing a number between zero and one. Closer to zero is less likely to happen, closer to one is more likely to happen. One half, or 50% means it is just a likely as something else.
I like to think of probability as a fraction. The top number is the number of ways to get what you want. The bottom number is the total number of possible outcomes. Here's how the book puts it: The surface area is the measure of the outside of the 3D shape. So, you have to find the areas of each of the sides and add them together. For surface area of a regular pyramid (which is what they are given in the book), find the area of the base. Then find the area of one of the triangle faces, multiply that by how many non base faces there are, then add that to the area of the base.
Volume of pyramids is just like for prisms, then divide by 3. So, (1) area of the base (2) times the height, then (3) divided by 3.
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AuthorI thought this would be a great spot to put the daily notes, so if you ever miss, or don't understand, you can check here. Archives
May 2018
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