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Year 9 - Maths

Using the fx-991CW for statistics

Calculator functionality

Unit Summary

This unit teaches how to use scientific calculators and expores their functionality

Lesson Summary

You will learn to use the fx-991CW to perform calculations with data.

Key Notes

  • Some calculators can perform more than just basic calculations.
  • The fx-991CW can produce a statistical summary of a set of data.
  • The summary includes the mean, median, upper and lower quartiles.

Vocabulary To Learn

  • Frequency: The frequency is the number of times an event occurs; or the number of individuals (people, animals etc.) with some specific property.
  • Mean: The (arithmetic) mean for a set of numerical data is the sum of the values divided by the number of values. It is a measure of central tendency representing the average of the values.
  • Median: The median is the central (middle) piece of data when the data are in numerical order. It is a measure of central tendency representing the average of the values.
  • Mode: The mode is the most frequent value. It is a measure of central tendency representing the average of the values.
  • Statstical Summary: A statistical summary sums up the features of a data set. It may contain the mean, median and/or mode which measure the central tendency. It may also contain the range which measures the spread.

Common Mistakes To Avoid

  • Calculators can only be used to add, subtract, multiply or divide.

3 Quick Questions (With Answers)

1. Solve this in steps: explain the method from this lesson and why each step matters.

Some calculators can perform more than just basic calculations. The fx-991CW can produce a statistical summary of a set of data.

2. Use this key word in a maths sentence and explain it clearly. 'Frequency'

The frequency is the number of times an event occurs; or the number of individuals (people, animals etc.) with some specific property. Use this word when showing your method, then check your final answer is reasonable.

3. Spot and fix this common maths mistake.

Mistake: Calculators can only be used to add, subtract, multiply or divide. Correction: They can be used to perform basic calculations but they can also do so much more.

More Lessons In This Unit

Browse all guides in the Year 9 Maths guide library.