Consider the frequency histogram for the distribution of the time, , in minutes of t telephone that Helen made last week. (a) Complete the frequency for this distribution. [2 marks] Time (minutes) Number of telephone calls < 0 5 t ≤ 5 < t ≤10 10 < t ≤15 15 < 20 t ≤ (This question continues on the following page) (Question 1 continued) (b) Write down the modal class. [1 mark] (c) Write down the mid interval value of the 10 < class. t ≤15 [1 mark] (d) Use your graphic display calculator to find an estimate for the mean time. [2 marks]
Consider the frequency histogram for the distribution of the time, t , in minutes of telephone that Helen made last week. (a) Complete the frequency for this distribution. [2 marks] Time (minutes) Number of telephone calls 0 < t ≤ 5 5 < t ≤10 10 < t ≤15 15 < t ≤ 20 (This question continues on the following page) (Question 1 continued) (b) Write down the modal class. [1 mark] (c) Write down the mid interval value of the 10 < t ≤15 class. [1 mark] (d) Use your graphic display calculator to find an estimate for the mean time. [2 marks]
y12_sl_studies_paper_1_assessment_jun_2013.docx