Engineering Board Exam Reviewer · Mean, Variance, and Standard Deviation · medium

A frequency distribution has class marks 10, 20, 30, 40 with frequencies 5, 8, 12, 5. Find the mean.

  1. 25
  2. 30
  3. 25.67
  4. 192.5

Answer

C. 25.67

Solution

x= fx/ f=5(10)+8(20)+12(30)+5(40)/30=770/30=25.67.

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