How many numbers do I divide by?
Mateo found the mean of 4, 8, 6, 5, 7 by adding to 30 and dividing by 4, writing 7.5. There are 5 numbers.
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1 lesson for “Mean, median, mode and range”
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What is the z-score of a test score of 85 when the mean is 80?
A z-score measures a data point in standard deviation units: how far it sits from the mean, and in which direction.
Try this lessonDoes heavy mean it sinks?
You said the steel ship is too heavy to ever float. The ship's average density, steel plus the air inside it, is less than water, so it floats.
Try this lessonWhat does minus a negative really mean?
Diego saw 5 - (-3) and wrote 2, as if the problem were 5 - 3. But the two minus signs are doing different jobs.
Try this lessonWhat does percent of really mean?
Ivan found 15% of 80 by computing 1.5 * 80 and wrote 120. He moved the decimal the wrong way when converting 15%.
Try this lessonWhich x values are allowed in f(x) = 1/(x - 2)?
A function's domain is the list of numbers you may feed it. A zero denominator is one number that is never allowed.
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