Tree Diagrams Mixed Demonstration This resource provides animated
- Slides: 8
Tree Diagrams – Mixed – Demonstration This resource provides animated demonstrations of the mathematical method. Check animations and delete slides not needed for your class.
Frequency Trees ① 100 Year 11 students were surveyed about whether they studied geography or art. 41 students studied geography. 25 students studied geography and art. 39 students didn’t study geography or art. If you pick a student at random, what is the probability they only study art? geography art 25 not art 16 art 20 not art 39 41 100 not geography 59
Unconditional Probability Trees Box & Marbles There are black and white marbles in the box. One is picked – and replaced – then another is picked. What is the probability of picking two black marbles? 1 st Pick 2 nd Pick Result Black BB Black White Black BW WB White WW ②
Conditional Probability Trees Box & Marbles There are black and white marbles in the box. One is picked – and not replaced – then another is picked. What is the probability of picking two black marbles? 1 st Pick 2 nd Pick Result Black BB Black White Black BW WB White WW ③
Conditional Probability Trees ④ The probability Jack passes his 1 st Geography test is 0. 7 If he passes the 1 st test, the probability he passes the 2 nd test is 0. 8 If he fails the 1 st test, the probability he passes the 2 nd test is 0. 6 What is the probability he passes only one of the tests? 1 st Test 2 nd Test Result Pass PP Fail PF Pass FP Fail FF Pass Fail
Questions? Comments? Suggestions? …or have you found a mistake!? Any feedback would be appreciated . Please feel free to email: tom@goteachmaths. co. uk