For which of these would you use a histogram to show the data?
The number of passengers boarding trains form 7.00 a.m. to 7.00 p.m at a station.
Give reasons for each.

For which of these would you use a histogram to show the data? The number of cassettes produced by 5 companies.

For which of these would you use a histogram to show the data? The number of letters for different areas in a postman's bag.

For which of these would you use a histogram to show the data? The height of competitors in an athletics meet.

A person trying to lose weight (dieter) lifts a 10 kg mass, one , thousand times, to a height of 0.5 m each time. Assume that the potential energy lost each time she lowers the mass is dissipated, (a) How much work does she do against the gravitational force? (b) Fat supplies 3.8 xx 10^7 J of energy per kilogram which is converted to mechanical energy with a 20% efficiency rate. How much fat will the dieter use up?