[填空题]
The histogram below shows the number of workixf2, ud+4tb;n msc*hk ng hours recorded by 145bxwpv r1 8,mgx7 86wlm employees in a company during a particular week, each measured correct to the nearest hour and then rounded to the nev87xpx 8, mm1rwwlbg6arest 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.
