Last week we began a unit over measures of central tendency and graph types. For those wondering what measures of central tendency are they are mean, median, mode, and range.
Mean - average - find the sum of the numbers in the set and divide the sum by how many numbers are in the list.
Median - the middle value once the numbers are put in order. If there are 2 numbers in the middle your median is the mean of those 2 values.
Mode - the number or numbers occurring the most. A set of data can have 1, 2, or 3 modes.
Range - the difference in the largest and smallest data values in the set.
We have also discussed several ways of presenting data using graphs.
We have looked at:
- a frequency distribution table
- a line plot
- a stem and leaf plot
- a bar graph
- a histogram
- a scatter plot (Monday)
We have looked at how to create and read each graph type.
Wednesday, we will be having a test over the content mentioned above and review again volume and surface area.
Thursday, we will begin reviewing concepts we covered during the first semester to make them fresh on their minds before the STAAR test. Our first round of testing will be March 30th and 31st with 7th grade Writing. Math and Reading will be April 21st and 22nd.
Examples problems: (Bonus Questions - 3 points each - copy each question, work them, circle your final answer with its correct label if one is needed and turn them in by Friday, March 27th.)
1. Tyler walked a total of 4 kilometers by making 2 trips to school. How many trips will Tyler have to make in all to walk a total of 10 kilometers? Assume the relationship is directly proportional.
A. 0.46
B. 14.68
C. 17.44
D. 526.69
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