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The distribution above shows the number of days a group of 260 students were abs...


Question

No. of days123456
No. of students20x50402x60

The distribution above shows the number of days a group of 260 students were absents from school in a particular term. How many students were absent for at least four days in the term

Options

A) 210

B) 40

C) 120

D) 160

The correct answer is D.

Explanation:

20 + X + 50 + 40 + 2X + 60 = 260
3X + 170 = 260
3X = 260 - 170
3x = 90
x = 30
Absent for at least 4 days
456
402x60

i.e 40 + 2x + 60 = 40 + (2 x 30) + 60
= 40 + 60 + 60
= 160

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Dicussion (1)

  • 20 + X + 50 + 40 + 2X + 60 = 260
    3X + 170 = 260
    3X = 260 - 170
    3x = 90
    x = 30
    Absent for at least 4 days

    456
    402x60

    i.e 40 + 2x + 60 = 40 + (2 x 30) + 60
    = 40 + 60 + 60
    = 160

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