The following table shows the ages of the patient of a certain disease admitted in a hospital during a year:
Age (in years) 6-15 16-25 26-35 36-45 46-55 56-65
Nummber of patients 6 11 21 23 14 5

Dear student
Age No.of patients fi xi di=xi-A where A=40.5 ui=di/h where h=10 fiui
5.5-15.5 6 10.5 -30 -3 -18
15.5-25.5 11 20.5 -20 -2 -22
25.5-35.5 21 30.5 -10 -1 -21
35.5-45.5 23 40.5 0 0 0
45.5-55.5 14 50.5 10 1 14
55.5-65.5 5 60.5 20 2 10
  fi=80       fiui=-37
Mean=A+h1Nfiui=40.5+10-3780=35.8
Regards

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