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Read class frequencies from a cumulative frequency table

This type of question, asked 2 times: CDS 1 2017, CDS 1 2025. All 2 questions below, oldest first.

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  1. Question 1

    CDS 1 2017

    58
    Consider the following frequency distribution :
    xFrequencyCumulative frequency
    188
    21018
    3f1f_129
    4f2f_245
    What are the values of f1f_1 and f2f_2 respectively ?

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  2. Question 2 (case study, 2 parts)

    CDS 1 2025

    Consider the following for the next two (02) items that follow : The frequency distribution of marks obtained by students in an English examination is given below :
    Marks obtainedNumber of Students
    Below 4050
    Below 50125
    Below 60210
    Below 70315
    Below 80350
    91
    What is the number of students who scored between 60 and 70 marks ?

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    92
    What is the number of students who scored more than 50 marks ?

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