find the mean and mode for the following frequency distribution class intervals : 330-369 370-389 390-409 410-429 430-449 450-469 frequency: 15,27,31,19,13,6
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class interval. frequency. xi
330-369. 15. 349.5
370-389. 27. 479.5
390-409. 31. 399.5
410-429. 19. 419.5
430-449. 13. 439.5
450-469. 06. 459.5
€fi=. 116.
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