1-2 Day 4 Describing Distributions with Numbers

# 1-2 Day 4 Describing Distributions with Numbers - AP...

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AP STATISTICS LESSON 1 – 2 ( DAY 1) Describing Distributions with Numbers

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Essential Question : What are the measures of center, when and how are they used? To find the mean of a data set To find the median of a data set To compare the mean and the median of data set
The Mean X To find the mean of a set of observation, add their values and divide the number of observations are x 1 + x 2, + x 3 , ……. .+ x n, , their mean is x = x 1 + x 2 + ………+ x n or in more compact notation x = 1 ∑ x i n n ∑ - ( capital letter sigma ) In the formula for the mean is short for “ add them all up”

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Input the following data sets into your calculator: Aaron’s 13, 27, 26, 44, 30, 39, 40, 34, 45, 44, 24, 32, 44, 39, 29, 44, 38, 47, 34, 40, and 20. Bond’s 16,19, 24, 25, 25, 33, 33, 34, 34, 37, 37, 40, 42, 46, 49, and 73. Ruth’s 54, 59, 35, 41, 46, 25, 47, 60, 54, 46, 49, 46, 41, 34, and 22
Warm – up Describe or write a formula for the mean and median of a data set.

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The Median M The median M is the midpoint of a distribution, the number such that half the observations are smaller and
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## This note was uploaded on 05/25/2010 for the course MATH 1231 taught by Professor Dr.driscoll during the Spring '10 term at Clayton College of Natural Health.

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1-2 Day 4 Describing Distributions with Numbers - AP...

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