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SingaporeMathsQuick questions
Statistics and Probability
Quick questions on Data handling and statistical diagrams explained: N(A)-Level Mathematics Statistics and Probability
6short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is organising data in a frequency table?Show answer
Raw data is first tidied into a frequency table, which lists each category or value alongside how many times it occurs (its frequency). The total of the frequencies is the number of items in the data set. A tally column can help when counting from a list.
What are bar charts?Show answer
A bar chart uses bars of equal width whose heights show the frequencies. The bars are separated by gaps (for categories such as favourite sport). Always label both axes and use an even scale so the heights compare fairly.
What are pictograms?Show answer
A pictogram uses a symbol to represent a fixed number of items, given in a key (for example, one symbol = books). Part-symbols show smaller amounts. To read a pictogram, multiply the number of symbols by the value in the key.
What are pie charts?Show answer
A pie chart shows how a whole is divided into parts, using sectors of a circle. The whole circle is , so each item's share of the angle is:
What is uneven scales on a bar chart?Show answer
The vertical scale must increase in equal steps, or the bars mislead.
What are no labels?Show answer
Axes and sectors must be labelled, or the diagram cannot be read; labels carry marks.
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