We cover the topics in Statistics II, averages.

While we commonly use the term “average” to mean the “arithmetic mean” in statistical sense, there are other kinds of averages in statistics.

We call the data scores, and the frequency is a term used to indicate the number of times a particular score occurs. We can use a frequency table to represent data, and use a histogram to represent the table.

Apart from the arithmetic mean or just mean, which is the sum of all scores divided by number of scores, we also have:

* Mode. which is the score that occurs most often in a distribution;

* Median, which is the middle score in the list (if the list has even number of scores, the median is the average of the middle two scores).

Homework:

Page 137: #1 – #12

Math contest results are out. We have several students who won:

Richard Chang: 1st place, 5th grade

Yuheng Dong: 2nd place, 6th grade

Aaron Zhang, 3rd place, 7th grade

Congratulations!

We cover reading and drawing of pie chart, line graphs, and pictograms. This is part of Statistics I.

Again, these are topics students feel intuitive and straight forward.

With the extra time, we go over some more of the math contest results.

Homework:

Page 130: #1, 2, 3, 6, 7, 9, 13, 14

Math contest results are almost out. We are waiting for one more class’ result to finalize the final winners. We know at least two of students in our class are winners.

We start the 2nd half of the spring semester with focus on statistics, the science about collection and representing data and how to read and draw different graphs.

We first introduce different ways to represent data: bar graph, pie chart, line graph, and pictogram graph. We talk about the pros and cons of each approach.

We then talk about how to read and draw bar charts.

With the extra time left, we talked about a few questions from math contest.

Homework:

P130. #3, 4, 10, 11, 12