# CBSE Class 10-Mathematics: Chapter –14 Statistics Part 12

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**Question 4:**

Draw a less than O give for the following frequency distribution.

Marks | No. of students |

**Answer:**

We have

Marks | Frequency (F) | C.F |

4 | ||

6 | ||

10 | ||

8 | ||

4 | ||

Upper class limits | |||||

Cumulative frequency | |||||

Plot the points |

Join these points by a free hand curve. We get the required give which is as follows:

**Question 5:**

Find the mean age in years from the frequency distribution given below:

Age | Total | |||||||

Frequency |

**Answer:**

We have

Class-Interval | Mid value | |||

Total |

Let assumed mean ‘a’ , Here

We know that Mean