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Statistics & Probability Vocabulary: Mean, Median, Mode & Range

Learn the basic statistics and probability vocabulary, including mean, median, mode, and range. Practice calculating these measures and understanding probability concepts.

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Statistics & Probability Vocabulary: Mean, Median, Mode & Range

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  1. Ms. Crusenberry 10-2013 Statistics & Probability

  2. Vocabulary • Statistics – the collection, organization and interpretation of numerical data • Probability – the likelihood of a certain event occurring expressed in a ratio or a fraction

  3. Mean, Median, Mode & Range • Mean – the average of a set of numerical data • Median – the number in the middle of a set of numerical data • Mode – the number that appears most often in a set of numerical data • Range – the difference between the highest and lowest number is a set of numerical data

  4. Mean • Add the numbers in the numerical set and then divide the sum by the number of amounts you added Ex. 10, 20, 15, 30 10+ 20+ 15 + 30 = 75 ÷ 4 = 18.75

  5. Median • Put the numbers in numerical order, find the middle numbers, add them and then divided by two, if you have an even set of numbers. If an odd set of numbers, the median is just the middle number.Ex. 5, 10, 15, 20, 25, 30 middle numbers are 15 and 20 15 + 20 = 35 ÷ 2 = 17.5Ex. 3, 6, 9, 12, 15 the middle number is 9

  6. Mode • Put all of the numbers in numerical order Ex: 1, 5, 5, 6, 8, 11 the number that repeats the most often is the 5

  7. Range • Subtract the lowest number from the highest number in the numerical setEx: 5, 10, 2, 25, 1825 – 2 = 23

  8. Practice Find the mean, median, mode and range of numerical set below. 56 61 49 32 90 75 23 101 32 mean = __________ median = _________ mode = ___________ range = ___________

  9. Answers • Mean = 57.67 • Median = 56 • Mode = 32 • Range = 78

  10. Probability • P = number of favorable outcomes total number of outcomes possible • There are five ways to show probability: fraction, decimal, ratio, percent, and words. ½ .5 1:2 50% The chances are one in two.There is a fifty percent or fifty-fifty chance.

  11. Let’s practice • A number cube with its sides numbered 1 through 6 is rolled twice. What is the probability of rolling a 2 and then a 5?**taken from Brown TABE D book a. 1/36 b. 11/30 c. 1/25

  12. Answer • A is the correct answer. The probability of a 2 being rolled is 1/6, and the probability of a 5 being rolled is 1/6. **taken from Brown TABE D book1/6 x 1/6 = 1/36

  13. Let’s Practice • Investigating Probability, Level D Blue Book page 152

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