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The monthly income of a group of 320 employees in a company is given below:

Monthly Income |
No. of Employees |

6000-7000 | 20 |

7000-8000 | 45 |

8000-9000 | 65 |

9000-10000 | 95 |

10000-11000 | 60 |

11000-12000 | 30 |

12000-13000 | 5 |

Draw an ogive the given distribution on a graph sheet taking 2 cm = Rs. 1000 on one axis and 2 cm = 50 employees on the other axis. From the graph determine:

(1) the median wage

(2) the number of employees whose income is below Rs. 8500.

(3) if the salary of a senior employee is above Rs. 11,500, find the number of senior employees in the company.

(4) the upper quartile.