The marks obtained by 50 students of a class in class 8 of a school in subject mathematics paper consisting of 100 marks are presented in table below.

Find the mean of marks obtained by the students.

Marks Obtained | Number of Students |

10 | 1 |

20 | 3 |

36 | 2 |

40 | 3 |

50 | 8 |

60 | 8 |

70 | 5 |

72 | 9 |

80 | 3 |

85 | 4 |

90 | 1 |

93 | 2 |

97 | 1 |