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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.