So friday we skipped mental math, and went right into the lesson which was measures of central tendancy & variability. The definition of this is simply it answeres the question how close are a bunch of values to the middle values.

Then we went on to talk about mean, median and mode.

Median - The middle number in a given sequence of numbers, taken as the average of the two middle numbers when the sequence has an even amount of numbers

ex) 4 is the median of 1, 3, 4, 8, 9.

Mean

Mode

Here is one of the examples that Mr. Max showed us.

Here are the measures of variability, i was not sure how to explain it.