He sounds quite a bit like my 9 yo son. I wouldn't say that it's "average" though! grin I think my 9 yo reads faster than my husband age 48.

My 9 yo made great strides in writing this year mostly because he is now fluent at typing. I don't think the reading being well ahead of the writing is too surprising. It can be extremely frustrating to be able to think very fast, but not be able to get that down on paper.