Construction of a cumulative frequency distribution table is useful in determining the

1. mean

2. median

3. mode

4. all the three measures

The median class for the given distribution is:

1. 0 - 10

2. 10 - 20

3. 20 - 30

4. 30 - 40

For the following distribution :

The sum of lower limits of the median class and modal class is

1. 15

2. 25

3. 30

4. 35

The modal class of a given distribution always corresponds to the:

1. Interval with highest frequency

2. Interval with lowest frequency

3. The first interval

4. The last interval