Question

OR In the following frequency distribution if the arithmetic mean is 45.6. find out missing frequency Wages 10-20 20-30 30-40 40-50 50-60 60-70 70-80 (Rs) Number of 5 6. 7 Х 4 3 9 workers​

Answer 1

Answer:

Thrme missing frequency of wages is 16.

Explanation:

Wages Numbers mid value(m) FM

10-20 5 15. 75

20-30 6. 25. 150

30-40 7 35. 245

40-50 X. 45. 45X

50-60 4. 55. 220

60-70 3. 65 195

70-80. 9. 75. 675

total = 34+X. total=1560+45X

Mean =45.6

Mean = Σ fm÷N

45.6= 1560+45X÷34+X

45.6*(34+X) = 1560+45X

1550.4+45•6X = 1560+45X

0.6X = 9.6

X= 16