Good evening, Ladies and Gents., I am looking for formulas fro the mean, median, quartiles all the above. I have a test this week and my text book hasn't come through the mail as of yet. I'm in need of the formulas only no ex., please. Help
L = Lower exact limit of the median class.
nb = Cumulative Frequency of the class preceding the median class
nm = Cumulative Frequency of the median class
i = the width of the median class.
N = the total.
median=L + i*(N/2 - nb)/nm
Hence the class 75-80 contains the median.