Question

which class interval of weekly wages has the maximum number of workers

Answer 1

The groups are called class intervals or class.The lowest number in class is called lower class limit while the highest number is called upper class limit. For example, in 11-20, 11 is the lower class limit and 20 is the upper class limit.Difference between the upper and lower class limit is called width or size of class interval.

Problem: The weekly wages (in ₹) of 30 workers in a factory are:

830, 835, 890, 810, 835, 836, 869, 845, 898, 890, 820, 860, 832, 833, 855, 845, 804, 808, 812, 840, 885, 835, 835, 836, 878, 840, 868, 890, 806, 840.

Using tally marks, make a frequency table with intervals as 800 – 810, 810 – 820 and so on.

Draw a histogram and answer the following questions.

(i) Which group has the maximum number of workers?

(ii) How many workers earn ₹ 850 and more?

(iii) How many workers earn less than ₹ 850?

Solution: