Find the mean of each of the following frequency distributions:
class interval: 0-10 10-12 20-30 30-40 40-50
Frequency: 9 12 15 10 14
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The mean of each of the following frequency distributions is :
Given :
Class interval: 0-10 10-12 20-30 30-40 40-50
Frequency: 9 12 15 10 14
• Table given in attachment
Width of class interval = 10
Total frequency = 60
• Formula of mean = Σ fi.xi / fi
•By calculating in table,
• Mean = f1.x1 + f2.x2 + f3.x3 + f4.x4 + f5.x5 / f1 + f2 + f3 + f4 + f5
= 45 + 180 + 375 + 350 + 630 / 60
= 1580 / 60 = 26.33
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