Mathematics 9709 · AS & A Level · Sampling and estimation
Sampling and estimation — practice question
Out of a group of 30 adults, 25 are right-handed and 8 wear spectacles. The number who are right-handed but do not wear spectacles is 19.
(i)[2]
Complete the table below to show how many adults are in each category.
(ii)[3]
A single adult is selected at random from the group. Event $X$ means 'the adult chosen is right-handed'; event $Y$ means 'the adult chosen wears spectacles'. Decide whether $X$ and $Y$ are independent events, giving a reason for your answer.
Worked solution & mark scheme
This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: “One correct row or column, including its total, other than the total row/column” …