Definition: The act of varying or the state of being variable.

Alright class, settle down now, let’s take a look today, At a word that can be tricky, in quite a complex way! We've got ‘variance’ on the board, a concept we must see, And the dictionary tells us, it's “the act of varying, you agree?” Let’s break it down simply, with a little rhyme or two, Variance is all about spread , for me and for you! Think of it like this: if you toss a coin, you might get heads, Or tails, again and again, the results aren't always spread. But if you toss it hundreds of times, a pattern starts to show – More heads than tails appear, a predictable flow! Variance measures how much data differs , you see, From the average or the mean, for all eternity! It's not just about one number, a single point in time, But how scattered your numbers are, in their rhythmic chime. A low variance means things tend to stay close and near, While a high variance shows that they’re spreading far and clear! Does that make sense, my dears? Any questions you might pose? Let's discuss it further now, before the bell blows!