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Percentage of students in a marks range

This type of question, asked 2 times: CDS 1 2021, CDS 1 2025. All 2 questions below, oldest first.

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  1. Question 1

    CDS 1 2021

    92
    The following table shows the marks of 90 students in a test of 80 marks :
    MarksNumber of students
    1-105
    11-208
    21-3010
    31-4013
    41-5018
    51-6017
    61-7012
    71-807
    The percentage of students who have obtained less than or equal to 50% marks is

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  2. Question 2

    CDS 1 2025

    99
    Marks obtained by 60 students in a test (Maximum Marks-100) are given below : 60, 82, 63, 40, 88, 80, 24, 60, 09, 58, 44, 74 57, 60, 63, 30, 31, 64, 00, 62, 37, 54, 10, 99 35, 83, 58, 33, 92, 43, 66, 41, 78, 72, 32, 33 65, 11, 60, 17, 53, 93, 57, 03, 29, 31, 82, 50 63, 15, 41, 55, 72, 42, 32, 23, 30, 48, 67, 34 What is the percentage (approximate) of students getting marks higher than or equal to 60 but less than 80 ?

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