Correct Answer: Option A

Explanation

\(mean(x) = \frac{20t}{5}\)

= S.D = \(\sqrt{\frac{((\overline{x} - x)^2}{\text{n}}}\)

\(\sqrt{2}\) = \(\sqrt{\frac{10t^2}{5}}\)

2 = \(\frac{10t^2}{5}\)

10t\(^2\) = 10

t\(^2\) = 1

t = \(\sqrt{1}\) = 1

There is an explanation video available below.

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