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  • The expected value(Mean) measures the central tendency, or the center of gravity of the population
  • It is given by:
  • A family has 4 members, father, mother and 2 kids Hemal and Rishi who are twins. The average age of the family members is 20 years. Age of mother and father is 30 and 32 respectively.
  • Can you tell the age of Hemal?  
  • The graph shows the mean of normal distributions


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