On a commodity exchange when booking trades with provision for stop-losses, a trader can make a profit of $\displaystyle \text{Rs } 20,000$ or incur a loss of $\displaystyle \text{Rs } 20,000$. The probabilities of making profit and incurring loss, from the past experience, are known to be $\displaystyle 0.75$ and $\displaystyle 0.25$ respectively. The expected profit to be made by trader should be

On ______ the frequency, starting from a rather low value, gradually reaches the maximum value, somewhere near the central part and then gradually decreases to reach its lowest value at the other extremity.

Divided bar chart is considered for

Data are said to be ______ if the investigator himself is responsible for the collection of the data.

A suitable graph for representing the portioning of total into sub parts in statistics is:

The average of salaries in a factory is $\displaystyle 47,000$. The statement that the average salary $\displaystyle 47,000$ is

Statistics cannot deal with ______ data.