數學問題求幫忙plz

1)5
2)
class interval......tally........frequency
86-90.................正................5
91-95.................正ll..............7
96-100...............正l.............. 6
101-105.............正ll..............7
106-110.............正l...............6
111-115.............l...................1
116-120.............l...................1
121-125.............ll...................2
126-130.............l....................1
131-135.............llll..................4
............................total.............40

*tally 要用四豎一橫(唔識形容)嘅方式，但係電腦打唔到，正係5，一豎係1，恕我唔識到

3)
IQ score less than..........cf
85.5.................................0
90.5.................................5
95.5.................................7
100.5...............................6
105.5...............................7
110.5...............................6
115.5...............................1
120.5...............................1
125.5...............................2
130.5...............................1
135.5...............................4
..........................total.......40

因為佢話total 要40 所以係咁，而唔需要計埋上個colum
(即95.5那個數，唔需要加埋90.5個數)

有咩唔明，可以補充