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Which measure is always the same as the 25th percentile?
lower quartile
What is the measure of quartile deviation?
A quartile deviation from some specified value, is the value or values such that a quarter of the observed values fall between these values and the specified value. Usually, but not always, the specified value is the median - the value such that have the observed values are below (and above) it. In that case, one quartile values will have a quarter of the values below it and the other will have a quarter of the values above it. The quartile deviations will be the differences between median and the two quartiles just calculated.
Will the quartile always be 25 percent 50 percent and 75 percent?
Yes. The prefix "quart" is derived from the word for 4, so quartile always means splitting the data into 4 sections, ie. 25%, 50%, 75%, 100%.
Is the sum of the measure of an acute angle and the measure of an obtuse angle always greater than 180 degree?
Not not always since an obtuse angle is always greater than 90 degrees and an acute angle is always less than 90 degrees.
Is congruent angles always 45 degrees?
No. If two angles are congruent they have the same measure. But that measure can be anything.
