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  5. 5, 8, 6 and k occur...

5, 8, 6 and k occur with frequency 3, 2, 4, and 1 respectively and...

Mathematics
JAMB 2009

5, 8, 6 and k occur with frequency 3, 2, 4, and 1 respectively and have a mean of 5.7. Find the value of k?

  • A. 4
  • B. 3
  • C. 2
  • D. 1
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Correct Answer: Option C
Explanation
x f fx
5 3 15
8 2 16
6 4 24
k i k
  ∑f=10 ∑fx=55+k  

 

Mean = ∑fx
∑fx

 

 

5.7 = 55+k
10


57 = 55 + k
k = 57 - 55
k = 2

 

There is an explanation video available below.

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WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
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Explanation Video

WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
WAEC offline past questions - with all answers and explanations in one app - Download for free
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
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WAEC offline past questions - with all answers and explanations in one app - Download for free
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
WAEC offline past questions - with all answers and explanations in one app - Download for free
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995