Oh dear

Just when I thought I was neginning to get the hang of this teaching thing..... along comes the lesson from hell to elbow me out of my incipient complacency. S3 again, doing statistics. But the problem is not the pupils. It's me. Just me. The whole me and nothing but the me. I'd moved them rapidly on to cumulative frequency curves as they were doing so well with frequency tables. So I dished out the graph paper and went merry through a worked example.Eerything was going swimmingly - the data was on a spreadsheet projected onto the interactive board, I'd pre-prepared two stages of the curve on the whiteboard (that got a laugh - I didn't even have to supply the "Here's one I prepared earlier" line, one of the pupils did that for me). So explained the purpose, did the median and added the upper and lower quartiles, checking all the while they were with me. When I got to the end, I set them onto another question and a single hand went up: "I don't get this...."
So I asked if anyone else was having problems. No response. I thought, "OK, if it's just Jason (name changed to protect the innnocent), that's a result. I'll go and help him while the others get on with the question."
Off I go to help Jason out. The conversation went something like this:
"So, where did I lose you?" (He's copied the curve beautifully by the way)
"Um, right at the start."
Oh.
"OK then I'll go through it again with you."
"Can I listen in too?" says one of his neighbours.
"Mmmmm. Me too please?" says another.
"And me...?"
Now I have the whole table involved. And when I finish there, I have to do the same thing at the next table.... you can guess the rest. Dammit.
Gonna have to do it over again tomorrow, with a simpler example. I'm going to do the curve for them though to save some time.