In a histogram the class interval or the groups are taken along
(a) Y-axis (b) X-axis
(c) both of X and Y axis (c) in between X and Y axis
In histogram , the class intervals or the groups are taken along X-axis.
The graph of y = a is
(a) the x - axis
(b) the y - axis
(c) a line parallel to y - axis
(d) a line parallel to x - axis