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Math A Review
 
Statistics
Mean: average
Median: Middle number or average of the middle numbers
when a list is in numerical order.
Mode: most often or most frequent
Range: Difference between the highest value and the
lowest value.
Frequency table: table of intervals and their frequencies
Frequency Histogram: a bar graph representing values
found from frequency table
Cumulative Frequency table: table of cumulative
intervals' frequencies starting at the lowest interval
Cumulative Frequency Histogram: a bar graph representing
the values found from the Cumulative table.
Quartiles and Percentiles
 Lower quartile or 25th percentile: 25% of the score fall
below a certain score.
 Middle quartile or 50th percentile: 50% of the scores at
or fall below a certain score.
 Upper quartile or 75th percentile: 75% of the scores at or
fall below a certain score.
 Finding the nth percentile: set up a percentile proportion
to find the one score the numbers in that percentile fall below, then count up
from the lowest interval to find the number's interval.
Modal Interval: Find the interval that has the highest
frequency
Median Interval: Find the nth middle number or numbers
and count up starting at the lowest interval and find that number's interval.
