29/33 Marks Hit:
400 people are asked if they drink tea.
To say Yes and 20% of the people who say Yes drink at least 3 cups each day.
a) Complete the frequency tree.
b) What fraction of the 400 people
drink at least 3 cups of tea
At least 3 cups
Drink tea
each day?
each day
Give your answer in its simplest
form.
Yes
56
84

280
Yes
No
25

400
No

Evaluate the integral. (sec2(t) i t(t2 1)8 j t7 ln(t) k) dt

Four airplanes carrying a total of 400 passengersarrive at the detroit airport. the airplanes carry, respectively,50, 80, 110, and 160 passengers. a) one of the 400 passengers is selected uniformly at random. let x denote the number of passengers that were on theairplane carrying the randomly selected passenger. find var(x)for x as given in the problemb) one of the 4 airplane drivers is also selected uniformly atrandom. let y denote the number of passengers on the chosen driver’s airplane. find var(y) for y as given in the problem

Which one ? is the answer and how to find this answer