## B

## Term |
## Definition |

bar graph | graph displaying information using bars |

base | the bottom of something |

bearing | measuring the angle clockwise from north. This would be a bearing of 160° |

beta | β Greek letter for b, commonly used to indicate unknown angles |

billion | 1 000 000 000 or 1000 million |

bi | prefix for 2. |

bimodal | distribution with two modes |

binomial | a polynomial with two terms (that are not like terms). eg: 2x + 1, 4s^{2} – 5b |

binomial expansion | expansion with two sets of brackets. eg: (x + 1)(x – 3) |

binomial probability | ^{n}C_{r} p^{r} (1 – p)^{n – r} where n is the number of trials, r is the number of successes, p is the probability of that event |

binomial theorem | (a + b)^{n} = ^{n}C_{0}a^{n} + ^{n}C_{1}a^{n- 1} b + ^{n}C_{2}a^{n – 2} b^{2} + ^{n}C3a^{n – 3} b^{3} +…… + ^{n}Cr a^{n – r} b^{r} + …….. ^{n}Cb_{n} = ∑r=0n ^{n}C a^{n-r}b^{r} |

bisect | to divide exactly in half |

bisector | the line that divides the angle, line, figure, etc in half |

bivariate data | data with more two variables: eg height and weight- often presented on scatterplots |

box and whisker plot | a plot to summarise basic statistics. The ‘whiskers’ show the minimum and maximum scores and the ‘box’ shows the lower quartile Q_{1}, the median and the upper quartile, Q_{3} |

boundary | the outside of a shape, or perimeter |

braces | { } Have the same function as parentheses (). Often used to supersede other brackets and parentheses. eg: {a + [x(2 + y) – z]} |

brackets | [ ] Have the same function as parentheses (). Often used just to help discriminate between multiple use of parentheses for ease of reading. |

breadth | width |