mark obtained by 10 student of a class are 13,11,8,9,9,15,16,19,20,9 find mean ,median and mode
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Step-by-step explanation:
Mean = sum of observations / no of observations
= (13 + 11 + 8 + 9 + 9 + 15 + 16 + 19 + 20 + 9) / 10
= 129 / 10
= 12.9
Arranging in ascending order
8,9,9,9,11,13,15,16,19,20
Median = ( n+1) th/ 2 term = (10+1)th/2 term = 11th/2 term = 5.5 th term
= 5th term + 6th term / 2
= 11 + 13 / 2
= 24 / 2
= 12
Mode = the highest number of frequency = 9
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