This are the requirement for Bsc Statistics at UCC
Department of Mathematics & Statistics
Post-Senior Secondary School Candidates
Candidates must obtain
(a) passes in Core English, Core Mathematics and Integrated Science or Social Studies
(b) passes in Elective Mathematics and any two of the following elective subjects: Physics, Chemistry, Biology and Economics: and
(c ) an overall aggregate of 36 or better in three core and three elective subjects.
ii. Candidates who satisfy the requirements in (i) (a) and (b) above but whose overall aggregate in the three elective subjects is more than 15 may enroll in the Remedial Science Programme and pass an Entrance Examination to enhance their chances of admission
As you can see, you can't apply because they need physics and chemistry.
In legon, these are the requirement
English, Mathematics, Biology/Agriculture, Physics and Chemistry plus one General Arts subject (for Mathematical Science, this should be Further Mathematics.)
This also means you can't apply.
If you an arts student and you want to do statistics at legon,
you should apply for this combination under BA arts
Computer Science, Mathematics, Statistics
Economics, Mathematics, Statistics
visit http://www.ug.edu.gh/index1.php?linkid=1177&sublinkid=774 for more information