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( a) The class interval 825-850 has the maximum frequency, i.e., 12. So, the class mark
825 + 850
.
of the class interval 825-850 = = 837 50
2
( b) 5 workers have their daily wages in the highest class interval (975 - 1000).
( c) In class interval 950-975, only 1 worker has his daily wages.

( d) The number of workers who have daily wages of `900 or more is 4 + 3 + 1 + 5 = 13.

Think and Answer
Ankit prepared a frequency distribution table showing the weights of 35 students in his class.

Weights( in kg) Tally marks Number of students
40-45 |||| 5
45-50 |||| || 7

50-55 |||| |||| | 11

55-60 |||| ||| 8
60-65 |||| 4
Total 35

Observe the table and answer the following questions:
1. What is the upper limit of the class interval 40-45?
2. What is the class mark of the class interval 45-50?
3. What is the class size of each class?
4. Which class interval has the highest frequency?
5. How many students weigh less than 50 kg?

Practice Time 4A

1. The weights (in g) of 20 parcels are given below.
93, 38, 36, 83, 40, 42, 53, 44, 63, 75, 31, 54, 64, 38, 77, 82, 30, 98, 74, 41

( a) What is the range of the data?
( b) Prepare a frequency distribution table using one class interval as (30-40), 40 not included.

2. The following are the number of members in 25 families of a village.
6, 8, 7, 7, 6, 5, 3, 2, 5, 6, 8, 7, 7, 4, 3, 6, 6, 6, 7, 5, 4, 3, 3, 2, 5.

Prepare a frequency distribution table for the data using class intervals 1-3, 3-5, etc.
3. Maximum temperature (in °C) for 30 days in a city is shown below.
21, 25, 15, 16, 18, 24, 23, 18, 20, 27, 28, 34, 37, 39, 26, 18, 33, 32, 31, 30, 36, 39, 39, 37, 36, 37, 25,
21, 16, 15
Make a grouped frequency table taking the class interval as 15-20, 20-25 and so on.

( a) Which class has the least frequency?
( b) Which class has the maximum frequency?

95 Data Handling