400 people are asked if they drink tea 7/10 say yes and 20% of the people who say yes drink at least 3 cups.

a)complete the frequency tree down below
b)what fraction of the 400 people drink at least 3 cups of tea each day? give the answer in the simplest form.>

56 people drink 3 cups daily

Step-by-step explanation:

What's the total number of people that drink 3 cups?

Total number of people = 400

7 / 10 were asked said yes

Number of people that said yes = (7 / 10) × 400 = 280

280 people drink tea.

20% of 280 people drink 3 cups daily, whats the number = ?

20% of 280 = ?

20 / 100 = x / 280

(20 × 280) = (100 × x)

5600 = 100x

X = 5600 / 100

X = 56 people

56 people drink 3 cups of tea daily.