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2

The marks scored by 20 students in a test are given below:

54, 42, 68, 56, 62, 71, 78, 51, 72, 53, 44, 58, 47, 64, 41, 57, 89, 53, 84, 57.

Complete the following frequency table:

(Marks in class intervals) | Tally marks | Frequency (No. of children) |

40-50 50-60 60-70 70-80 80-90 |

What is the class interval in which the greatest frequency occurs?

3

The following is the distribution of weights (in kg) of 52 persons :

Weight in kg | Persons |

30-40 40-50 50-60 60-70 70-80 | 10 15 17 6 4 |

(i) What is the lower limit of class 50-60?

(ii) Find the class marks of the classes 40-50, 50-60.

(iii) What is the class size?