Question

find the mean of the following distribution class marks 0 to 20 20 to 40 40 to 60 60 to 80 80 to 100 frequency 17 28 32 2419 ​

Answer 1

class. class. frequency. x f

mark=x. =f

0-20. 10. 17. 170

20-40. 30. 28. 840

40-60. 50. 32. 1600

60-80. 70. 24. 1680

80-100. 90. 19. 1710

Σf=120. Σxf=6000

now,

$\frac{}{x} = \frac{Σxf}{Σf}$

$\frac{6000}{120} = 50$

therefore,

mean of the given frequency table is 50.

Answer 2

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