Frequency Trees – Demonstration

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Presentation transcript:

Frequency Trees – Demonstration This resource provides animated demonstrations of the mathematical method. Check animations and delete slides not needed for your class.

20 students were surveyed about whether they had a pet. How many females had no pet? How can we make this easier? Male with pet Female & no pet Female with pet Male & no pet

We want to split the data to 20 students were surveyed about whether they had a pet. There were 8 male students & 12 female students. 6 male students had a pet. 7 female students had a pet. How many female students didn’t have a pet? Frequency Trees ① We want to split the data to make it easy to read. pet 6 8 male 2 no pet 20 pet 7 female 12 5 no pet

8 14 6 30 9 16 7 blonde male not blonde blonde female not blonde 30 students were surveyed about their hair. There were 14 male students and 16 female students. 8 male students had blonde hair. 9 female students had blonde hair. How many male students didn’t have blonde hair? Frequency Trees ② blonde 8 14 male 6 not blonde 30 blonde 9 female 16 7 not blonde

15 21 6 50 10 29 19 art geography not art art not geography not art 50 Year 11 students were surveyed about whether they studied geography or art. 21 students studied geography. 15 students studied geography and art. 19 students didn’t study geography or art. How many students only studied art? Frequency Trees ③ art 15 21 geography 6 not art 50 art 10 29 not geography 19 not art

27 45 18 100 20 55 35 100 35 drama male not drama drama female 100 Year 10 students were asked if they studied drama. 27 male students studied drama. 47 students in total studied drama. There were 55 females. How many male students didn’t study drama? If you pick a random student, what is the probability they are a female student who doesn’t study drama? Frequency Trees ④ drama 27 45 male 18 not drama 100 drama 20 55 female 35 100 35 not drama

tom@goteachmaths.co.uk Questions? Comments? Suggestions? …or have you found a mistake!? Any feedback would be appreciated . Please feel free to email: tom@goteachmaths.co.uk