[填空题]
Uber, the ride sharing te x90 4w1lm-c4tce w s)*hnplkuchnology service, zf4q5q:fjg:n conducts a study of 80 of their drivers in San Fransisco to determine how many kilometers they travel each month. The distance each driver travelled in April is re j:qffnq4g :z5corded. The cumulative frequency curve for this data is shown below.
1. Find the number of drivers that travelled a distance between 3200 and 5000 kilometres.
2. Use the cumulative frequency curve to find the
(1) median distance; km
(2) lower quartile; km
(3) upper quartile. km
3. Hence, find the interquartile range.
4. Write down the percentage of drivers that travelled a distance greater than the upper quartile.
5. Find the number of drivers that travelled a distance less than or equal to 2750 $\mathrm{~km}$ .
t is known that 11 drivers travelled more than m kilometres. %
6. Find the value of m .
The smallest distance travelled by one of the drivers was 500 $\mathrm{~km} $. The longest distance travelled by one of the drivers was 6000 $\mathrm{~km} $.
7. On graph paper, draw a box-and-whisker diagram for these data. Use a scale of $2 \mathrm{~cm$} to represent 1000 $\mathrm{~km}$ .
