Tree Diagram Lesson 2

Question 1

Bronze example:

25 names in a hat
13 girls
A name is chosen, put back into the hat and another name is chosen.
What is the probability of two boys being picked?

Answer 1

Ans: 144/625

Question 2

Silver example:

11 sweets in a jar
3 cola, rest lemon
Jane wants 2 cola
If she chooses a lemon first, she puts it back.
Draw probability tree for this information.
Calculate the probability she gets a cola.

Answer 2

Ans: 57/121

Question 3

A frequency tree shows…

Answer 3

how a group/people/things can be broken up into categories

Question 4

What do frequency tables look like?

Answer 4

They look similar to a tree diagram but are very different!

Question 5

Gold example

A running club has 160 members.
74 of the club members are female.
58 of them are over 18.
21 of the males are under 18.

Complete a frequency table to show this info.

Find the probability that a member of the club chosen at random is under 18.

Answer 5

Frequency table example in book from 22/11/21 lesson.

Ans to question 2: 37/160