| Date | May 2011 | Marks available | 2 | Reference code | 11M.2.hl.TZ1.1 |
| Level | HL only | Paper | 2 | Time zone | TZ1 |
| Command term | Estimate | Question number | 1 | Adapted from | N/A |
Question
The cumulative frequency graph below represents the weight in grams of 80 apples picked from a particular tree.
Estimate the
(i) median weight of the apples;
(ii) 30th percentile of the weight of the apples.
Estimate the number of apples which weigh more than 110 grams.
Markscheme
(i) median = 104 grams A1
Note: Accept 105.
(ii) 30th percentile = 90 grams A1
[2 marks]
\(80 − 49\) (M1)
\(= 31\) A1
Note: Accept answers 30 to 32.
[2 marks]
Examiners report
On a very straightforward question there were many correct answers. However, there was evidence that some candidates had not previously encountered cumulative frequency graphs and hence scored low marks on the question.
On a very straightforward question there were many correct answers. However, there was evidence that some candidates had not previously encountered cumulative frequency graphs and hence scored low marks on the question.
