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13

Find the mean deviation about the median for the following data :

X | 10 | 15 | 20 | 25 | 30 | 35 | 40 | 45 |

F | 7 | 3 | 8 | 5 | 6 | 8 | 4 | 9 |

14

Find the mean deviation about the mean for the following data :

Mark | 0-10 | 10-20 | 20-30 | 30-40 | 40-50 | 50-60 |

Number of Students | 6 | 8 | 14 | 16 | 4 | 2 |

16

Find the mean deviation about the mean for the following data :

class | 30-40 | 40-50 | 50-60 | 60-70 | 70-80 | 80-90 | 90-100 |

Frequency | 3 | 7 | 12 | 15 | 8 | 3 | 2 |

17

Find the mean deviation about the median for the following data :

class | 0-10 | 10-20 | 20-30 | 30-40 | 40-50 | 50-60 |

Frequency | 6 | 7 | 15 | 16 | 4 | 2 |

18

Find the mean deviation about the median for the following data :

class | 0-10 | 10-20 | 20-30 | 30-40 | 40-50 | 50-60 |

Frequency | 6 | 8 | 11 | 18 | 5 | 2 |

3

Using short cut method, find the mean, variation and standard deviation for the data :

x | 4 | 8 | 11 | 17 | 20 | 24 | 32 |

f | 3 | 5 | 9 | 5 | 4 | 3 | 1 |

8

Using short cut method, find the mean, variation and standard deviation for the data :

Class | 30-40 | 40-50 | 50-60 | 60-70 | 70-80 | 80-90 | 90-100 |

Frequency | 3 | 7 | 12 | 15 | 8 | 3 | 2 |

3

The mean and variance of the heights and weights of the students of a class are given below:

Heights | Weights | |

Mean | 63.2 inches | 63.2 kg |

SD | 11.5 inches | 5.6 kg |

Which shows more variability, heights or weights?