Measures Of Dispersion Jamb Mathematics Past Questions

Question 16

Age in years 10 11 12
No of pupils 6 27 7
The table above shows the number of pupils in each age group in a class. What is the probability that a pupil chosen at random is at least 11 years old?

jamb 2007

  • A. 27/40
  • B. 17/20
  • C. 3/30
  • D. 33/40
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Question 17

What is the mean deviation of 3, 5, 8, 11, 12 and 21?

jamb 2007

  • A. 4.7
  • B. 60
  • C. 3.7
  • D. 10
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Question 18

marks 3 4 5 6 7 8
frequency 5 (y-1) y 9 4 1
The table above gives the frequency distribution of marks obtained by a group of students in a test. If the total mark scored is 200, calculate the value of y

jamb 2007

  • A. 15
  • B. 13
  • C. 11
  • D. 8
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Question 19

If x > 0, find the range of number x-3, 3x+2,x-1, 4x, 2x-1, x-2, 2x-2, 3x and 3x+1

jamb 2008

  • A. 3x+3
  • B. 3x+1
  • C. 2x+5
  • D. 2x+1
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Question 20

Find the mean deviation of 2, 4, 5, and 9

jamb 2008

  • A. 1
  • B. 2
  • C. 5
  • D. 7
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