[填空题]
The cumulative frequency cu h(w,roixp5qodg6c ,4 rve below shows the8onhif1)o x -s number of hours spent by 60 students on their IB homework duxi o1 n8ho-s)fring 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.
