## 36. The following table shows the number of working hours and the number of employees employed in a small scale industry

No. of working hours
No. of employees
3 - 5
7
5 - 7
10
7 - 9
18
9 - 11
57
11 - 13
14
13 - 15
8

The average number of working hours of an employee is

No. of working hours | No. of employees |

3 - 5 | 7 |

5 - 7 | 10 |

7 - 9 | 18 |

9 - 11 | 57 |

11 - 13 | 14 |

13 - 15 | 8 |

The average number of working hours of an employee is

## 37. In Arun’s opinion, his weight is greater than 65 kg but less than 72 kg. His brother does not agree with Arun and he thinks that Arun’s weight is greater is that 60 kg but less than 70 kg. His mother’s view is that his weight cannot be greater than 68 kg. If all of them are correct in their estimation, what is the average of different probable weights of Arun?

## 38. The mean of the first ten even natural number is-

## 39. The average of the first nine prime numbers is-

## 40. The arithmetic mean of first 11 natural numbers is

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