[填空题]
The histogram below shows txwz8cqkd 04v6 he number of worki8pc3j5kz6 t *os/jrhhng hours recorded by 145 employees in aht/h6cr * pj5sojk 3z8 company during a particular week, each measured correct to the nearest hour and then rounded to the nearest units of 10 hours.
1. Write down the modal working time of the employees. hours
2 . Find the median working time.
The upper quartile is 50 working hours. hours
3. Calculate
(1) the lower quartile; hours
(2) the interquartile range.
