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NSWMaths Standard 2Quick questions
Year 11: Data Analysis
Quick questions on Measures of central tendency for HSC Maths Standard 2
5short 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 the mean?Show answer
The mean of a list is the total of all the values divided by the number of values:
What is the median?Show answer
The median is the middle value of the ordered data. Always sort the data first. Then:
What is the mode?Show answer
The mode is the value (or category) that occurs most often. For the value occurs three times, more than any other, so the mode is . A data set can have:
What is estimating the mean from grouped data?Show answer
Sometimes data is grouped into class intervals (for example , ) and the individual values are lost. To estimate the mean you replace each class by its class centre, the midpoint of the interval:
What is choosing the most appropriate measure?Show answer
Different data sets call for different measures. The deciding factors are outliers and skew:
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