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The table above is the distribution of data with mean equals to 3. Find the value of y.

Marks 1 2 3 4 5
Frequency 2y - 2 y - 1 3y - 4 3 - y 6 - 2y


The table above is the distribution of data with mean equals to 3. Find the value of y.
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  • A 5
  • B 2
  • C 3
  • D 6
Correct Answer: Option B
Explanation:
Marks (x) 1 2 3 4 5
Frequency (f) 2y - 2 y - 1 3y - 4 3 - y 6 - 2y 3y + 2
fx 2y - 2 2y - 2 9y - 12 12 - 4y 30 - 10y 26 - y


Mean = \(\frac{\sum fx}{\sum f}\)

\(3 = \frac{26 - y}{3y + 2}\)

\(3(3y + 2) = 26 - y\)

\(9y + 6 = 26 - y\)

\(9y + y = 26 - 6\)

\(10y = 20 \implies y = 2\)

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