Duration of International Calls 64 Number of Calls 10 8 16 24 32 40 48 Duration (minutes) 2.1.1 What is the sample size? (3) 2.1.2 How many intervals are used in the construction of the ogive? (3)2.1.1 What is the sample size? 2.1.2 How many intervals are used in the construction of the ogive? 2.1.3. What is the most frequently occurring time of calls? 2.1.4. Half of the calls are shorter than howr many minutes? 2.1.5. What is the percentage of the calls that are longer than 24 minutes? 2.1.6. Approximate the number of the calls are 10 minutes or less? (3) (3) (3) (3) (4) (4)