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# GMAT Prep - Math

### Statistics

Question | Answer |
---|---|

Mode - | Middle term in a set of numbers arranged in numerical order |

Mode - | The number that appears the most in a set |

Range - | Positive difference between the largest and smallest terms in a set |

True or false - In a sequence of consecutive or evenly spaced integers, the average DOES NOT equal the median. | False |

What's the formula for finding the number of terms in a sequence of consecutive integers? | (Largest - Smallest)+1 |

If one wants to find the number of terms in a sequence of multiple of 4 between smallest and largest, one calculates using what formula? | (Largest-Smallest)/4 +1 |

Average formula = | (largest + Smallest)/2 |

If one wants to find the average of a sequence of multiples of 4 between 13 and 29.... | (28 + 16)/2 |

Combination - | Gives the number of unordered subgroups of k items that can be selected from a group of n different items. n!/k!(n-k)! |

Permutation - | Gives the number of ordered subgroups of k items that can be made from a group of n different items. n!/(n-k)! |

True or false - For permutation, order DOES matter, while in combination, order DOES NOT matter. | True |

Probability formula = | (# of desired outcomes)/(# of possible outcomes) |

If the outcome of one event doesn't affect the probability of another, then it is __________ event. | Independent |

If the outcome of one event does affect the probability of another, then it is _________ event | Dependent |

To determine the probability of a non-mutually exclusive event, one uses the formula: | P(A) + P(B) - P(A&B) |

To determine the probability of a mutually exclusive event (Both events cannot occur at the same time), then one uses the formula: | P(A) + P(B) |

Standard deviation - | Dispersion of the set of numbers around the mean. |

Multiply SD by a whole number - | Set numbers get spread out |

Multiply SD by a fraction - | Set numbers get closer together |

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U0105006