1. Modal Class Exercise

2. The masses, in grams, of 100 potatoes are shown in the table below: Mass (m) gramsFrequency 0 < m  20 1 20 < m  40 17 40 < m  60 28 60 < m  80 25 80 < m  100 19 100 < m  120 10 Calculate the mean mass of potatoes and work out the modal class and median mass. Add another column for ? and another row for ? Mid mass x frequency Totals

3. Mass (m) grams FrequencyMid mass x frequency 0 < m  20 110 20 < m  40 17510 40 < m  60 281400 60 < m  80 251750 80 < m  100 191710 100 < m  120 101100 Totals1006480 Mean Modal class Median Mean is Grams How would we find out the mean? Divide by

4. Mass (m) grams FrequencyMid mass x frequency 0 < m  20 110 20 < m  40 17510 40 < m  60 281400 60 < m  80 251750 80 < m  100 191710 100 < m  120 101100 Totals1006480 Modal class What does mode mean? So which is the most or biggest frequency? 28 Which class does the 28 appear? 40 < m  60

5. Mass (m) grams FrequencyMid mass x frequency 0 < m  20 110 20 < m  40 17510 40 < m  60 281400 60 < m  80 251750 80 < m  100 191710 100 < m  120 101100 Totals1006480 Median What does median mean? What is the middle frequency? 50 Working down from the top, where would the 50th value be found? What mass class is this in? 60 < m  80

6. Now make the Cumulative Frequency diagram AND box plot. Mass (m) grams FrequencyMid mass x frequency 0 < m  20 110 20 < m  40 17510 40 < m  60 281400 60 < m  80 251750 80 < m  100 191710 100 < m  120 101100 Totals1006480 Cumulative Frequency 10 520 1920 3670 5380 6480

7. Min Max LQ M UQ