- 9th
- Maths
- Statistics
- Collection and Presentation of Data

Statistics

Maths

Class 9

ExampleDefinitionsFormulaes

Class interval | Frequency |

$10−20$ | $5$ |

$20−30$ | $10$ |

$30−40$ | $4$ |

$40−50$ | $15$ |

(a) What is the lower limit of the second class interval ?

(b) What is the upper limit of the last class interval ?

(c) What is the frequency of the third class ?

(d) Which interval has a frequency of $10$?

(e) Which interval has the lowest frequency ?

(f) What is the class size ?

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$9,17,12,20,9,18,25,17,19,9,12,9,12,18,17,19,20,25,9,12,17,19,19,20,9$

What is the range of marks?

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Marks obtained | 0-10 | 10-20 | 20-30 | 30-40 | 40-50 |

Number of students | 6 | 10 | 12 | 32 | 20 |

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$−12.5,−10.8,−18.6,−8.4,−10.8,−4.2,−4.8,−6.7,−13.2,−11.8,−2.3,1.2,2.6,0,2.4,0,3.2,2.7,$

$3.4,0,−2.4,−2.4,0,3.2,2.7,3.4,0,−2.4,−5.8,−8.9,−14.6,−12.3,−11.5,−7.8,−2.9.$

Represent them as frequency distribution table taking $−19.9$ to $−15$ as the first class interval.

Represent them as frequency distribution table taking $−19.9$ to $−15$ as the first class interval.

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$39,16,30,37,53,15,16,60,58,26,28,19,20,12,14,24,$ $59,21,57,38,25,36,24,15,25,41,52,45,60,63,18,26,$$43,36,18,27,59,63,46,25,33,46,42,48,35,64,24$.Take class intervals as $(10−20),(20−30),....$ and answer the following:

(i) What does the frequency corresponding to the third class interval mean?

(ii) What is the size of each class interval? Find the midpoint of the class interval $30−40$.

(iii) What is the range of the given set of scores?

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(i) Ages of students in years in class VI B of a school:

12,13,13,14,14,14,14,13,13,14,13,14,13,13,12,14,13,14,12,13

(ii) The median used by students of class VI B of a school to listen to music:

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