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Given below is the frequency distribu...

Given below is the frequency distribution of wages (in Rs.) of 30 workers in a certain factory:
`{:("Wages (In Rs.)", 110-130,130-150,150-170,170-190,190-210,210-230,230-250),(" No. of workers", ""3,"4","5","6","5","4","3"):}` A worker is selected at random. Find the probability that his wages are:
(i)less than Rs. 150            (ii)  at least Rs. 210 (iii)more than or equal to 150 but less than Rs. 210

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