How_To_Be_Good_At_Math
STATISTICS • THE MODE 279 The mode The mode is the value that occurs most often in a set of data. It is also called the modal va ...
280 STATISTICS •^ THE RANGE Let’s find the range of our giraffes’ heights. First, we’ll write down their heights in order, from ...
STATISTICS • USING AVERAGES 281 Using averages Whether it’s best to use the mean, median, or mode depends on the values in your ...
282 STATISTICS •^ PICTOGRAMS Pictograms In a pictogram, or pictograph, small pictures or symbols are used to represent data. To ...
STATISTICS • PICTOGRAMS 283 How many people aged 11 to 18 visited? There are four full symbols plus one half symbol. So the calc ...
284 STATISTICS •^ BLOCK GRAPHS This tally chart shows the results of a survey that asked children which fruit they liked best. L ...
STATISTICS • BAR CHARTS 285 Bar charts A bar chart uses bars or columns to represent groups or sets of data. The size of each ba ...
286 STATISTICS •^ DRAWING BAR CHARTS Drawing bar charts To draw a bar chart you need a pencil, a ruler, an eraser, coloured pens ...
Drawing bar charts Now let’s start drawing the bars for our instruments. The first frequency in the table is 7, which represents ...
288 STATISTICS •^ LINE GRAPHS Let’s look at this line graph. It shows the average monthly temperatures recorded in Maths Town ov ...
STATISTICS • LINE GRAPHS 289 Let’s see how tall Jacob was aged 6. We find 6 on the x axis and then go straight up. This graph ha ...
290 STATISTICS •^ DRAWING LINE GRAPHS Drawing line graphs A pencil, ruler, graph paper, and some data are all that’s needed to d ...
Drawing line graphs When we’ve plotted all the temperatures, we use a ruler to draw a straight line to link each pair of crosses ...
292 STATISTICS •^ PIE CHARTS Let’s look at this pie chart. It shows the types of film that a group of school children said they ...
STATISTICS • PIE CHARTS 293 Because it is a circle, a pie chart is a round angle of 360°. Each sector that makes up the chart ta ...
294 STATISTICS •^ MAKING PIE CHARTS Let’s use the data in this frequency table to draw a pie chart. The sectors will represent t ...
Making pie charts Now we align the protractor with the lower edge of the lemon sector and measure a 90° angle for the mango sect ...
296 STATISTICS •^ PROBABILITY With dice, there are six possible results A smaller fraction means a lower Probability With a coin ...
STATISTICS • PROBABILITY 297 It's likely that at least one person among the pupils and staff at your school will have a birthday ...
298 STATISTICS •^ CALCULATING PROBABILITY Calculating probability We can use a simple formula to help us work out the probabilit ...
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