S2/3-S1: Data Analysis

 DATA ANALYSIS 

Average = mean = Add all numbers/ how many numbers there are

Mode = the number/things that appears the most time.

Median = middle number in a ‘sorted list of values’

Example: 

Number list [ 2,3,9,3,6,2,3,4]

Average/Mean = 2+3+9+3+6+2+3+4 / 8 = 4

Arranged Number list [2,2,3,3,3,4,6,9]

Mode = 3 (appear the most number of times)

Median = (3 + 3) / 2 = 3 (for even list of number0

If arranged number list is [2,2,3,3,4,5,6,9,9]

        median = 4 [(Total number in list – 1) / 2]

From Frequency Table

            

Mean = (0x3) + (1x6) + (2x0) + (3x2) + (4x1) / (3+6+0+2+1)

Mode = 2 (has the highest frequency)

Median:

Total Frequency = 3+6+2+1 = 12

For even frequency, position of median number is 12/2 = 6 => Position is 6 and 7.

Median = 1

For odd frequency, position of median number is (total frequency -1)/2