Why do this problem?
requires learners to use the different forms of data to answer questions. It is made harder by the fact that they will need to look at more than one chart/table/graph in order to answer a single question.
The individual charts are not too difficult to interpret and so a good way into this activity might be to ask some introductory questions about a few of them in turn, just concentrating on one at a time.
At a basic level, this might involve just checking that the class know what M, T, W etc stand for in the calendar and similarly what J, F, M etc mean. You might also want to ask whether there are more boys or more girls in this class. These initial questions will enable the group to become more familiar with the data without the problem itself becoming trivial.
After this introduction learners could work in pairs on the problem on a computer or from a printed sheet so that they are able to talk through their ideas with a partner.
You may find it useful to have larger copies of the charts to project or have on the board. Here are pdfs each containing an enlarged image:
Which graphs do you think you need to look at to answer that question?
What do you think M, T, W etc/ J, F, M etc/ ZB, EH, AG etc stand for?
What days of the week will the presentation day not be on?
How many birthdays are there in June? What days of the week are they on?
Can you find out any children who have the same birthdays?
Learners could collect similar data from the class and make their own charts, graphs etc.
Suggest doing The Pet Graph
instead which has much less information.