In order to draw a frequency polygon by using a histogram, which of the following statements is incorrect?
A graphical representation of a frequency distribution in the form of rectangles with class interval as bases and heights proportional to corresponding frequencies such that there is no gap between any two successive rectangles is called a
In a frequency distribution, the class-width is 4 and the lower limit of first class is 10. If there are six classes, the upper limit of last class is
A frequency polygon is drawn for the following data. So the x-coordinate of the point having y coordinate as 21 is
A frequency polygon is made by joining the mid points of each bar of a histogram along with 2 imaginary class intervals. Hence, for any point on a frequency polygon the y co-ordinate is the frequency and x co - ordinate is the Class Mark of the interval. In this case, the class mark of the interval 20-30 is 25.
Following table gives marks and number of students of a class:
Which point on the frequency polygon will have its y coordinate as 21?