Given Independent Random Variables with Means and Standard Deviations as Shown,find

question 38

Multiple Choice

Given independent random variables with means and standard deviations as shown,find the mean and standard deviation of the variable 2X. $$\begin{array} { c | c c } & \text { Mean } & \text { SD } \\\hline \mathrm { X } & 40 & 5 \\\mathrm { Y } & 70 & 8\end{array}$$

• A)? = 80,? = 5
• B)? = 42,? = 5
• C)? = 42,? = 10
• D)? = 80,? = 10
• E)? = 80,? = 20

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Definitions:

Class Tardiness

The act of being late to class, which can affect both academic performance and classroom dynamics.

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Documentation or logs that track instances of being late, often used in educational or occupational settings.

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An individual involved in the management and supervision of a school, including responsibilities like policy implementation and staff coordination.

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The biased allocation of participants into groups in an experimental design, which can affect the outcome.