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Observe the following frequency polygon ...

Observe the following frequency polygon and write the answers of the questions below it .

(1) Which class has the maximum number of students?
(2) Write the classes having zero frequency.
(3) What is the mark of the class, having frequency of 50 students ?
(4) Write the lower and upper class limits of the class whose class mark is 85.
(5) How many students are in the class `80 - 90` ?

Text Solution

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(1) The class `60-70` has the maximum number of students .
(2) The classes `20-30` and `90-100` have zero frequencies.
(3) The class mark of the class, having frequency of 50 students is 55.
(4) The lower class limit and the upper class limit of the class whose class mark is 85 are 80 and 90 respectively. (Class mark 85 is of the class 80-90)
(5) There are 15 students in the class 80-90.
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Observe the following frequency polygon and write the answers of the questions below it. i . Which class has the maximum number of students? ii . Write the classes having zero frequency. iii . What is the class mark of the class, having frequency of 50 students ? iv . Write the lower and upper class limits of the class whose class mark is 85 . v . How many students are in the class 80-90 ?

The class, in which the marks of maximum number of students lies, is

Knowledge Check

  • The data below shows the number of students in class A having secured different marks. What is the mean marks of class A?

    A
    2
    B
    3.8
    C
    2.8
    D
    1.6

  • Consider the following frequency distribution The upper limit of the median class in

    A
    17
    B
    17.5
    C
    18
    D
    18.5

  • If m is the mid-point and l is the upper limit of a class in a continous frequency distribution, then lower class limit of the class is

    A
    `2m + l`
    B
    `2m-l`
    C
    `m-l`
    D
    `m-2l`

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