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This lab asks you to use 100 six-sided dice, or similar cubes. If you do not have access to that many dice, you can use the Live Lesson recording instead, just filling out your worksheet with the results from the video.
Find the half-life of Lokium by counting how many rolls it takes for half of the dice (or whatever cubes you use) to be taken out. For example, if you drop below 50 remaining cubes on the fifth roll, the half-life of Lokium is 5.
Since we're doing two trials, you can just take an average between the half-lives you found in each trial. So if on one you got 6 and another you got 5, you could say the half-life is 5.5. Now to find the age of the imaginary 'rock' you found. You just need to make up a number of atoms you're pretending you found in the rock, so you can choose anything between 1 and 100. So suppose you chose 25 as your number—find in your data (you can pick just one of your data tables to use for this) how many rolls it took to reduce your cubes down to 25 remaining. That number will be the age of your rock, in thousands (so if it took 8 rolls to reduce your cubes to 25 or less, your rock is 8,000 years old).