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2 cards from this section. Quick, good the night before a test.
What is the arithmetic mean of the following numbers: 10, 20, 30?
Add the numbers together and divide by how many numbers there are.
Calculate the mean of 5, 15, and 25.
Count the total and divide by the count.
What is the arithmetic mean formula?
Remember, it’s about summing and dividing.
True or False: The arithmetic mean can be affected by extreme values.
Think about how a very high or low score impacts the average.
In a survey, five different people reported the amount of time they spend reading per week: 10, 25, 20, 15, and 30 hours. How much should another participant contribute to ensure that the new average reading time becomes 20 hours?
Calculate the total hours needed and subtract the current total.
A teacher calculated that the average test score of 12 students was 75. If one student’s score was omitted, resulting in an average of 72, find the omitted score.
Use the average formulas to express the omitted score.
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