A graphical representation in which we represent frequencies in bars is called a:

For what value of $x$ will the mode of the following data be $27$? 

$23, 24, 25, 23, 27, 28, x, 24, 26, 27, 24, 23, 27$

In order to get the overall, at-a-glance impression of the data, the most useful representation is:

Given below is a data set of temperatures (in $°C$).What is the range of the data?

$-6, -8, -2, 3, 2, 0, 5, 4, 8$

A coin is tossed $10$ times and the outcomes are observed as. What is the probability of getting Head?

$H, T, H, T, T, H, H, T, H, H$

($H$ is Head; $T$ is Tail)