Question

Buying cameras The brands of the last 45 digital single-lens reflex (SLR) cameras sold on a popular Internet auction site are listed here. Make a relative frequency bar graph for these data. Describe what you see.

Short answer

Canon dominates all other brands.

Step-by-step solution

Step 1. Given information.

The given table is:

Step 2. Find the relative frequency of each camera brand.

Camera Brand	No. of Cameras	Relative Frequency
Canon	23	$\frac{23}{45}=0.511\mathrm{or}51.1\%$
Nikon	11	$\frac{11}{45}=0.244\mathrm{or}24.4\%$
Sony	6	$\frac{6}{45}=0.133\mathrm{or}13.3\%$
Fujifilm	3	$\frac{3}{45}=0.066\mathrm{or}6.7\%$
Olympus	2	$\frac{2}{45}=0.044\mathrm{or}4.4\%$
Total	45

Step 3. Construct a frequency bar graph.

Canon clearly outnumbers all other brands, as evidenced by the bar graph, which shows that each brand on the right has half the relative frequency of the brand on the left.