Correct Answer: Option C

Explanation

\(\overline{x}\) = \(\frac{\sum x}{\text{n}}\)

\(\overline{x}\) = \(\frac{ x + y + z + t }{\text{4}}\) = 5

x + y + z + t = 20

but y = 4

x + 4 + z + t = 20

x + z + t = 20 - 4 = 16

median = \(\frac{ y + z}{2}\) = z

= 2z = 4 + z

= 2 z - z = 4

z = 4

Then, x + t + 4 = 16(since z = 4)

x + t = 16 - 4 = 12.

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