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Arithmetic Mean - Ungrouped Data

7 mins

Arithmetic Mean - Discrete Series

10 mins

Arithmetic Mean - Continuous Series

9 mins

Arithmetic Mean - Special Property and Weighted Mean

6 mins

Relation between Mean, Median and Mode

4 mins

ExampleDefinitionsFormulaes

Important Questions

Class Interval | $0−10$ | $10−20$ | $20−30$ | $30−40$ | $40−50$ |

Frequency | $7$ | $8$ | $12$ | $13$ | $10$ |

Easy

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Monthly consumption (in units) | Number of consumers |

$65−85$ | $4$ |

$85−105$ | $5$ |

$105−125$ | $13$ |

$125−145$ | $20$ |

$145−165$ | $14$ |

$165−185$ | $8$ |

$185−205$ | $4$ |

Medium

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Marks | Number of students |

o and above | 80 |

10 and above | 77 |

20 and above | 72 |

30 and above | 65 |

40 and above | 55 |

50 and above | 43 |

60 and above | 28 |

70 and above | 16 |

80 and above | 10 |

90 and above | 8 |

100 and above | 0 |

Medium

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Medium

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Class Interval | $0−10$ | $10−20$ | $20−30$ | $30−40$ | $40−50$ | $50−60$ |

Frequency | $8$ | $5$ | $12$ | $35$ | $24$ | $16$ |

Medium

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Daily expenses (in Rs.) | 100-150 | 150-200 | 200-250 | 250-300 | 300-350 |

No. of households | 4 | 5 | 12 | 2 | 2 |

Easy

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Daily pocket allowance (in $Rs.$) | $11−13$ | $13−15$ | $15−17$ | $17−19$ | $19−21$ | $21−23$ | $23−25$ |

Number of children | $7$ | $6$ | $9$ | $13$ | $f$ | $5$ | $4$ |

Medium

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Medium

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Class: | $3−5$ | $5−7$ | $7−9$ | $9−11$ | $11−13$ |

Frequency: | $5$ | $10$ | $10$ | $7$ | $8$ |

Medium

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Medium

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