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21Find the mean and mode age in years for the following frequency distribution:Age (in years)10 19 20 29 30-3940 49 50 59 60 69No. of persons10142812Р.T.О. |
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Answer» lets take age=x so and z is the average of age.so table will be like following:x z no.of persons10-19 14.5 820-29 24.5 830-39 34.5 1040-49 44.5 1450-59 54.5 2860-69 64.5 12 so mode =(14.5*8+24.5*8+34.5*10+44.5*14+54.5*28+64.5*12)/(8+8+10+14+28+12) = 44.75 and bahulak is the number which one is appear frequently or more no. of times so here 8 is appearing more than any number so bahulak is 8. |
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