Question

find the mean of the following data by step devlatin method
c•i 5-15 15-25 25-35 35-45 45-55 55-65
f 6 11 21 23 14 5​

Answer 1

Step-by-step explanation:

Class Frequency

fi Mid−value 

xifixi 25−35 6 30 180 35−45 10 40 400 45−55 8 50 400 55−65 12 60 720 65−75 4 70 280  ∑fi=40  ∑fixi=1980 ⇒  x=∑fi∑fixi=401980=49.5

Answer 2

Answer:

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