For which of these would you use a histogram to show the data: 

(a) The number of letters for different areas in a postman’s bag. 

(b) The height of competitors in an athletics meet. 

(c) The number cassettes produced by 5 companies. 

(d) The number of passengers boarding trains from 7.00 a.m. to 7.00 p.m. at a station. Give reason for each.

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