MEASURES OF CENTRAL TENDENCY AND DISPERSION

(Mean, Median, and Mode)

LEARNING THE CONCEPTS

Mean, Median, and Mode are all concepts in math that work together

Mean: The mean is the sum of scores divided by the number of scores (ex. 10,12,2 10+12+2=24 24 /3=8 Mean=8)

Median: To find the Median you need to order the numbers given, find the 2 middle numbers(Only if the amount of numbers is even), add and divide by 2 and you found your median. If the amount of numbers is odd the middle number is the median.

(ex. 30, 12, 8, 50 12+8=20 20/2=10 Median=10) Mode: A Mode is the number that occurs the most in the group of

numbers given. (ex. 15, 15, 27, 62, 46 Mode=15)

QUESTIONS

Find the Mean:

5, 10, 7, 6, 16, 19

Find the mode:

54, 75, 165, 243, 867, 75, 623

Find the Median:

13, 45, 76, 845,82 <( The 845 is an example of an outlier)

OTHER CONCEPTS

Outlier: The number that stands out from the rest( normally is a number that is much greater or a lot less than most of the other numbers or in other words the number or numbers that or not in the majority )

Range: When you have all of the given numbers in order from least to greatest or greatest to least ,you subtract the smallest number from the greatest number.This is the number in between all numbers(not median)

These are commonly used with the key concepts from the previous slides.