Bar charts (Horizontal and vertical forms, approximate values ): Practice Questions

A vertical bar chart shows the number of toys sold in a week. If the scale on the vertical axis is 1 cm representing 5 units, what value is represented by a bar that is 8 cm tall?

A student is constructing a horizontal bar chart for data sets: \(118, 242, 355,\) and \(409\). If the student decides to use approximate values rounded to the nearest ten and a scale where 1 cm represents 20 units, what is the length of the longest bar?

A vertical bar chart displays data for four cities. The scale shows increments of 200. The bar for City A is 120 units high. The bar for City B is Southwest of City A on a map. If the value for City A is an approximate value rounded to the nearest 100, and the original value was 1149, what is the approximate value displayed?

In a horizontal bar chart, the length of a bar represents the quantity. If the scale of the chart is 1 cm to 10 units, how long would a bar representing 85 units be?

A vertical bar chart has a scale where 1 unit represents 50 kg. There are two bars: Bar A represents 250 kg and Bar B represents 400 kg. What is the difference in height between Bar A and Bar B on the chart?

A vertical bar chart uses a scale where each grid line represents 20 units. If the value for 'Category X' is rounded to the nearest 100 and the actual value is 342, what is the approximate value represented by the height of the bar?

In a horizontal bar chart showing the number of visitors to a park, the scale is set at one unit to 50 visitors. If the bar for Sunday represents 824 visitors rounded to the nearest hundred, how many units long will the bar be on the chart?

A vertical bar chart is used to show the number of visitors to a theme park over three days. The scale on the vertical axis is one unit to 100 people. The number of visitors are as follows:
Friday: 420 visitors
Saturday: 875 visitors
Sunday: 640 visitors

(a) If the data for Saturday is recorded as an approximate value by rounding to the nearest hundred, what value will be used for the bar?
(b) Based on your answer in part (a), how many units high will the bar for Saturday be on the chart?

The table below shows the amount of recycled paper collected by four classes in a week. A horizontal bar chart is to be constructed where 1 cm represents 5 kg of paper.

Class 4A: 23 kg
Class 4B: 38 kg
Class 4C: 14 kg
Class 4D: 31 kg

(a) To fit the scale of the bar chart, the teacher rounds each value to the nearest 10 kg to get approximate values. List the approximate values for each class.
(b) Using the approximate values from part (a), calculate the length (in cm) of the longest bar and the shortest bar in the chart.
(c) What is the difference in length between the bars for Class 4B and Class 4C using these approximate values?