It shows how little you know of the Somalis.
I would agree, and would even put the number higher than 30%.
Indeed so. I learnt how to read, and write Arabic (not spoken) before I even learnt Somali (written).
Postscript:
Let me draw a distinction between spoken, and written form of the language. Many, who could read, and write might not speak it, for it is not used in their daily life. For instance, I had a Japanese classmate at uni, who could not order food at the cafe, let alone engage in class discussions, or debate teams, yet would pen some of the best essays in English.