There are: 1000/20 = 50
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If most the population has many high scores, the distribution is negatively skewed. If most have many low scores, it is positively skewed
Ah, a millennium is a very special unit of time. It's not just one year or ten years, but a whole one thousand years! Just imagine all the beautiful landscapes and happy little trees that could grow and change over such a long period of time. It's truly a magical length of time to ponder.
A score is 20, so 4 score is 80.
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To find the average, add the scores and divide the sum by how many scores you are adding: 81 + 76 + 91 + 73 + 79 = 400 ÷ 5 = 80.