Maths-
General
Easy

Question

Find the mean of the following distribution

  1. 45    
  2. 65    
  3. 55    
  4. 85    

The correct answer is: 55


    We were given a frequency distribution table and should find mean
    G e n e r a l space f o r m u l a space o f space m e a n space equals sum for blank of f i x i divided by sum for blank of f i
T o space f i n d space sum for blank of f i x i space w e space c a n space w r i t e space a s space
begin inline style stack sum f i x i space equals space 10 cross times 7 plus 30 cross times 8 plus 50 cross times 10 plus 70 cross times 15 plus 89 cross times 10 space equals space 2750 with blank below end style
sum for blank of f i space equals space 7 plus 8 plus 10 plus 15 plus 10 equals 50
H e n c e space m e a n space equals 2750 over 50 equals 55

    Mean = 55

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