MMMR From Histograms

To understand how to calculate measures of central tendancy and spread of data sets presented in histograms

1. I can find the mean, median, mode and range of various data sets presented in histograms

2. I can create a frequency table based on the information presented in a histogram

Median: 2.5

Step 1: Add up the frequencies (in this case 14)

Step 2: Add 1 then divide by 2 (in this case 7.5)

Step 3: Because we got 7.5 we average the 7th and 8th score.

7th Score: 2

8th Score 3

Average: 2.5

Mean: 2.6

Step 1: Create an "fx" column which is

score x frequency

Step 2: Sum the fx's: (in this case 37)

Step 3: Divide the fx total by the frequency total

37/14 = 2.6