15 t < 20 95 ≤ 20 t < 25 90 ≤ 25 t < 30 35 ≤ 30 t < 35 15 ≤ 35 t < 40 5 ≤ (a) Complete the cumulative frequency table. (1) (b) On the grid, draw the cumulative frequency for your table. (2) (c) Use your graph to find an estimate for the median age of the people. .......................................................... (1) (Total 4 marks) An operator took 100 calls at a call centre. The table gives information about the time (t 5. seconds) it took the operator to answer each call. Time (t seconds) Frequency Cumulative Frequency 0 < t 10 16 ≤ 10 < t 20 34 ≤ 20 < t 30 32 ≤ 30 < t 40 14 ≤ 40 < t 50 4 ≤ (a) Complete the cumulative frequency (1) (b) On the grid, draw a cumulative frequency graph for your table. (2) (c) Use your graph to find an estimate for the number of calls the operator took more than 18 seconds to answer. .......................................................... (2) 5 marks) 6. 200 students took a test. The cumulative frequency graph gives information about their marks.
15 ≤ t < 20 95 20 ≤ t < 25 90 25 ≤ t < 30 35 30 ≤ t < 35 15 35 ≤ t < 40 5 (a) Complete the cumulative frequency table. (1) (b) On the grid, draw the cumulative frequency for your table. (2) (c) Use your graph to find an estimate for the median age of the people. .......................................................... (1) (Total 4 marks) 5. An operator took 100 calls at a call centre. The table gives information about the time (t seconds) it took the operator to answer each call. Time (t seconds) Frequency Cumulative Frequency 0 < t ≤ 10 16 10 < t ≤ 20 34 20 < t ≤ 30 32 30 < t ≤ 40 14 40 < t ≤ 50 4 (a) Complete the cumulative frequency (1) (b) On the grid, draw a cumulative frequency graph for your table. (2) (c) Use your graph to find an estimate for the number of calls the operator took more than 18 seconds to answer. .......................................................... (2) 5 marks) 6. 200 students took a test. The cumulative frequency graph gives information about their marks.