Warm up 1/16/13 Activating Background Knowledge 1.What do you think of when you hear the word “average”? 1.In words, describe what the “average” of a set.

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Presentation transcript:

Warm up 1/16/13 Activating Background Knowledge 1.What do you think of when you hear the word “average”? 1.In words, describe what the “average” of a set of data tells us. 1.What formulas do you know that relate to average?

Unit 4: Describing Data EQ: How can I measure central tendency with set of data? Standards: MCC9-12S.ID.1-2

Mean, Median, Mode, Range and MAD

Mean is the average of a set of data. To calculate the mean, find the sum of the data and then divide by the number of data.

12, 15, 11, 11, 7, = / 6 = 11.5 First, find the sum of the data. Then divide by the number of data. The mean is 11.5

You try the next one! You can remember that “mean” means to average because the “mean teacher averages your grade.”

An electronics store sells CD players at the following prices: $350, $275, $500, $325, $100, $375, and $300. What is the mean price? Find your answer before clicking!

$350 + $275 + $500 + $325 + $100 +$375 + $300 = $2225 $2225 / 7 = $ The mean or average price of a CD player is $

Median is the middle number in a set of data when the data is arranged in numerical order.

12, 15, 11, 11, 7, 13 First, arrange the data in numerical order. 7, 11, 11, 12, 13, 15 Then find the number in the middle or the average of the two numbers in the middle = / 2 = 11.5 The median is 11.5

Find your answer before clicking! An electronics store sells CD players at the following prices: $350, $275, $500, $325, $100, $375, and $300. What is the median price?

First place the prices in numerical order. $100, $275, $300, $325, $350, $375, $500 The price in the middle is the median price. The median price is $325.

The mode is the number that occurs the most.

12, 15, 11, 11, 7, 13 The mode is 11.

Sometimes a set of data will have more than one mode. For example, in the following set the numbers both the numbers 5 and 7 appear twice. 2, 9, 5, 7, 8, 6, 4, 7, 5 5 and 7 are both the mode and this set is said to be bimodal.

Sometimes there is no mode in a set of data. 3, 8, 7, 6, 12, 11, 2, 1 All the numbers in this set occur only once therefore there is no mode in this set.

$100, $275, $300, $325, $350, $375, $500 What is the mode ? Find your answer before clicking!

$100, $275, $300, $325, $350, $375, $500 There is no mode!

You can remember that mode means the number that occurs the most because “mode” and “most” sound alike!

The range of a set of data is the difference between the largest and the smallest number in the set. For example, consider the following set: 40, 30, 43, 48, 26, 50, 55, 40, 34, 42, 47, and 50 To find the range you would take the largest number, 50, and subtract the smallest number, – 26 = 29 The range is 29!

Mean The average MedianThe number or average of the numbers in the middle Mode The number that occurs most

How far off the mark is your shot? Are you consistent? How could we tell? MEAN ABSOLUTE DEVIATION