(a(i))[1]
Find the percentage of students who chose chemistry.
(a(ii))[2]
Find the fraction of students who chose physics. Give your answer in its simplest form.
(a(iii))[2]
For the numbers of students choosing each subject, find the ratio biology : chemistry : physics. Give your answer in its simplest form.
(a(iv))[1]
Explain how Marcus knows this.
(a(v))[2]
Work out the number of students who choose physics.
(b(i))[1]
Work out the total number of students in the class.
(b(ii))[1]
Find the value of $n(G)$.
(b(iii))[1]
Find the probability that the selected student studies geography and history.
(b(iv))[1]
Complete the Venn diagram to show the change.