(i)[3]
Draw a back-to-back stem-and-leaf diagram to display the data.
(ii)[2]
Make two comparisons between the estimates made by the adults and the children.
Mathematics 9709 · AS & A Level · Sampling and estimation
Sampling and estimation — practice question
Some adults and some children were each asked to estimate, without using a watch, how many seconds had passed in a fixed time-interval. Their estimates are shown below.
Adults: 55, 58, 67, 74, 63, 61, 63, 71, 56, 53, 54, 78, 73, 64, 62.
Children: 86, 95, 89, 72, 61, 84, 77, 92, 81, 54, 43, 68, 62, 67, 83.
Worked solution & mark scheme
This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Correct single stem and key - including adults, children and seconds” …
- Full mark scheme, point by point
- Step-by-step worked solution
- Write your answer & get it marked instantly by AI