The width of each class interval of a grouped frequency distribution is 8. The lower boundary of the class whose mid-value is 10 is :

1. 2

2. 4.5

3. 5.5

4. 6

The width of each class of a frequency distribution is 5. The upper boundary of the class whose class mark is 25 is :

1. 22

2. 22.5

3. 27

4. 27.5

Mid value for the class interval 19.5 - 29.5 is :

1. 14.5

2. 24.5

3. 15.5

4. 25.5

Case Study

To maintain the health report card in a hospital, the weights of new born babies are recorded on regular basis.

During a week, the weights (in kg) of new born were recorded as below :

2.7, 2.6, 3.1, 2.2, 2.4, 2.9, 3.0, 2.5, 2.8, 2.5, 2.8, 2.9, 2.2, 2.9, 2.7, 2.8, 2.3, 2.8, 2.1, 2.2

Based on the above information, answer the following questions:

1. Range of the data is :
   (a) 1 kg
   (b) 0.4 kg
   (c) 0.5 kg
   (d) 1.1 kg

2. How many babies are born during the week?
   (a) 10
   (b) 16
   (c) 17
   (d) 20

3. How many babies weigh less than 2.4 kg?
   (a) 7
   (b) 6
   (c) 5
   (d) 4

4. How many babies weigh more than 2.7 kg?
   (a) 10
   (b) 9
   (c) 8
   (d) 7

5. How many babies weigh 2.8 kg?
   (a) 4
   (b) 5
   (c) 6
   (d) 3