2. September 9, 2010 A Class B Tally C Frequency D Percent A B AB O

3. How to Make a Frequency Table for numerical data. Step 1: –Determine classes. –Find the highest value and lowest value: H= 90 L=37 –Find the Range: 90 - 37 = 53 –Determine number of desired classes: 8 –Find the Class Width: Width = Range ÷ # of classes Width = 53/8 = 6.625 Always round up: 7

4. Class LimitTallyFrequency Total 35 – 41 42 – 48 49 – 55 56 – 62 63 – 69 70 – 76 77 – 83 84 – 90

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6. Highest Temperatures in Each State Highest Value: Lowest Value: Range: Number of Classes: 7 Class Width: Range / # of classes Class Width: Starting Pt: 134 100 34 34/7 = 4.857 = 5 100

7. Class LimitsClass Boundaries TallyFrequency 100-104 105-109 110-114 115-119 120-124 125-129 130-134

8. Finding Class Boundaries Start with first class limit. –100-104 Subtract and Add 0.5 to class Limit –100 - 0.5 = 99.5 –104 +0.5 = 104.5 First class Boundary –99.5 – 104.5

9. Class LimitsClass Boundaries TallyFrequency 100-104II2 105-109IIIIIIII8 110-114IIIIIIIIIIIIIIIIII18 115-119IIIIIIIIIIIII13 120-124IIIIIII7 125-129I1 130-134I1 99.5 – 104.5 104.5 – 109.5 109.5 – 114.5 114.5 – 119.5 119.5 – 124.5 124.5 – 129.5 129.5 – 134.5

10. Cumulative Frequency Step 1 –Start with Lowest Class boundary –99.5 Step 2 –Count the frequency numbers below it. Step 3 –Use next boundary and continue process < 99.5 < 104.5 <109.5 < 114.5 < 119.5 < 124.5 < 129.5 <134.5 0 2 10 28 41 48 49 50

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