This post first appeared on Mrs. Lynch's Blog
Formulas are
Fancy
As we finished traditional division last week and explored spreadsheets, it seems time to consider the wide world of formulas. To calculate grades individually, we divided the points earned by the points possible. To calculate the average, we added up all of the scores and divided by the amount of tests. Where might you find other data to break down? Tell me a story with real data. Show me your formula to solve. You must have an even amount of data. Your question must end like this: What is the mean, median, mode and range? Is there an outlier? What is it? When calculating the mean and median, be sure to write out the formula equation.
I entered Mrs. Lynch's math class at the beginning of the year. So far we have had 6 math tests. I received these percentage grades. 95, 89, 72, 80, 65 and 91. What is the mean, median, mode and range? Is there an outlier? What is it? When calculating the mean and median, be sure to write out the formula equation.
Answer
Mean: 82%
95+89+72+80+65+91 = 82
6
Or
(95+89+72+80+65+91)/6 = 82
Median: 84.5%
80+89 = 84.5
2
Or
(80+89)/2 = 84.5
Mode: No data is repeated so there is no mode.
Range: 95-65=30
Outlier: 65 could be an outlier, but there isn't a great deal of data. It is the furthest removed from the rest of the data. And it is the only grade that is a D.
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