The mean of 100 items is 49. It was discovered that three items which should have been 60, 70, 80 were wrongly read as 40, 20, 50, respectively. The correct mean is

(i) Make a grouped frequency distribution table for this data, taking class width $5$ and one of the class intervals as $5-10$.
(ii) How many children watched television for 15 or more hours a week?

Construct a grouped frequency distribution table for this data, using class intervals of size $0.5$ starting from the interval $2-2.5$.