During the survey, it is possible that you might have interviewed only a few people from a specific age group and many people from some other age group. For example, you might have interviewed only a few people from the age group of 60 to 70 and many people from 30-40 age group.  If you compare the number of people who have high or low BP in these two age groups,  it would be like comparing the marks you got out of 100 in a final exam (for example 22/100)  to the marks you got out of 25 in a unit test (22/25).  Do you think  it would be a fair comparison?

One way to compare such data is by calculating percentages. 22 out of 100 would be 22% , while 22 out of 25 would be 88%! Use the following table to calculate the percentages for each age group.

Which age group has the highest percentage of respondents with high BP according to your survey data?

Out of all the people you have interviewed, can you also calculate the percentage of people not getting their BP checked?
(Tip: you will have to calculate the percentage using the total number of people who have not checked BP against the total number of people you have interviewed.)

You can use these percentages to make a bar chart of your data. Use the following graph or your own graph sheet.
First, use pencil to make bar charts of percentage people in each age group who have  either high or low BP. Do not forget to label the x and the y axis of your graph.

In your own words, describe the pattern you see on the graph.