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The marks obtained by 35 students in a t...

The marks obtained by 35 students in a test in statistics (out of 50) are as below.
`{:(35,1,15,35,45,23,31,40,21,13,15),(20,47,48,42,34,43,45,33,37,11,13),(27,18,12,37,39,38,16,13,18,5,41),(47,43, , , , , , , , ,):}`
Construct a frequency distribution table with equal class intervals, one of them being 10-20 (20 is not included).

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