[填空题]
The cumulative frequency curve belowy8zgz 85su5dsu l lkun w80o.+ shows the number of hours spent by 60 st xu iub4 jtp23;;-z2gzi(nk znudents on their IB homework duringx uuz zki(2 tjpb;;ig-nnz423 one week.
1. Write down the median value of this data. Give your answer correct to the nearest hour. hours
2. The upper quartile of this data is 10.1. Find the interquartile range, giving your answer correct to one decimal place.
3. The minimum number of hours spent by students on their homework is zero. The maximum number hours spent by students is 14 . Draw a box-and-whisker diagram to represent this data.
4. The 60 students sampled were chosen by randomly sampling 30 students from Diploma Program Year 1 and 30 students from Diploma Program Year 2. Both the Year 1 and Year 2 cohorts had the same number of total students. Write down the sampling method used.
