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

2. 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

3. 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

4. 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

5. 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

6. 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

9. tom@goteachmaths.co.uk Questions? Comments? Suggestions?
…or have you found a mistake!?
Any feedback would be appreciated .
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