The mean of $10$ numbers is 7. If each number is multiplied by 12, then the mean of new set of numbers is

The data that is collected needs to be organised in a proper table, so that it becomes easy to understand and interpret.

2. Average:

Average is a number that represents or shows the central tendency of a group of observations or data.

3. Central Tendencies:

(i) Arithmetic mean is one of the representative values of data.

(ii) Mode is another form of central tendency or representative value. The mode of a set of observations is the observation that occurs most often.

(iii) Median is also a form of representative value. It refers to the value which lies in the middle of the data with half of the observations above it and the other half below it.

4. Bar Graph:

(i) A bar graph is a representation of numbers using bars of uniform widths.

(ii) Double bar graphs help to compare two collections of data at a glance.

5. Random Experiment:

An experiment in which the result of a trial cannot be predicted in advance is called a random experiment.

6. Outcome of an Experiment:

An event associated to a random experiment is the collection of some outcomes of the experiment.

7. Empirical Probability:

The Empirical probability of happening of an event $E$ is defined as

$P\left(E\right)=\frac{\mathrm{Number} \mathrm{of} \mathrm{trials} \mathrm{in} \mathrm{which} \mathrm{the} \mathrm{event} \mathrm{happend}}{\mathrm{Total} \mathrm{number} \mathrm{of} \mathrm{trials}}$.