Problem: | Cheryl took 7 math tests in one marking period. What is the range of her test scores? | |

89, 73, 84, 91, 87, 77, 94 | ||

Solution: | Ordering the test scores from least to greatest, we get: | |

73, 77, 84, 87, 89, 91, 94 | ||

highest - lowest = 94 - 73 = 21 | ||

Answer: | The range of these test scores is 21 points. | |

Definition: | The range of a set of data is the difference between the highest and lowest values in the set. |

In the problem above, the set of data consists of 7 test scores. We ordered the data from least to greatest before finding the range. We recommend that you do this, too. This is especially important with large sets of data.