Question

400 people are asked if they drink the tea
7/10 say yes and 20% of the people who say yes drink at least 3 cups each day complete the frequency tree.
What fraction of the 400 people drink at least 3 cups of tea each day?

Answer 1

Step-by-step explanation:

There are a total of 400 people, therefore to work out how many people said yes you would need to divide 400 by 10 which would equal 40 then times 40 by 8 which comes to 320. To establish how many people said no you would take 320 away from 400 which comes to 80. For the second half of the question you need to work out 25% of 320. Given 25% is equivalent to 1/4 you need to divide 320 by 4 which comes to 80. Then take 80 away from 320 to get 240 people who said no.To write out the frequency tree you would start with 400 which would then branch out to 320 yes, 80 no, then from the yes branch out into a further 80 yes and 240 no.