Dave is doing a study on recycling. He visited the civic amenity site (CA site) and household waste recycling center (HWRC) where the public can dispose of household waste to collect his data.

Following are the amount of waste (in tons) on three different items most collected by the two facilities in a month:

Compost Paper and Card Glass CA site 497 427 330 HWRC 275 386 154

a. Help Dave to construct an appropriate graph for the data he collected.

b. In a brief report for Dave, describe the observations on the graph drawn in part a.