Question

find the mean of the following data. class interval=0-10,10-20,20-30,30-40,40-50.frequency=8,12,10,11,9.​

Answer 1

class interval frequency x fx

0 - 10. 8. 5. 40

10 - 20. 12. 15. 180

20 - 30. 10. 25. 250

30 - 40. 11. 35. 385

40 - 50. 9. 45. 405

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n = 50. fx = 1260

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$mean \: = \: \frac{fx}{n}$

$mean \: = \: \frac{1260}{50}$

$mean \: = 25.2$

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