Compute the Variance and Standard Deviation of a Discrete Random $x$

question 104

Multiple Choice

Compute the Variance and Standard Deviation of a Discrete Random Variable
-In a sandwich shop, the following probability distribution was obtained. The random variable $x$ represents the number of condiments used for a hamburger. Find the mean and standard deviation for the random variable x.
$\begin{array}{c|c}x & P(x) \\\hline 0 & 0.30 \\1 & 0.40 \\2 & 0.20 \\3 & 0.06 \\4 & 0.04\end{array}$

• A) mean: \(1.14\); standard deviation: \(1.04\)
• B) mean: \(1.54\); standard deviation: \(1.30\)
• C) mean: \(1.30\); standard deviation: \(2.38\)
• D) mean: \(1.30\); standard deviation: \(1.54\)

---

Definitions:

Elaborative Rehearsal

A memory technique that involves enriching the information to be remembered by adding meaning or connecting it to existing knowledge.

Rote Rehearsal

A memorization technique that involves repeating information over and over without necessarily understanding or analyzing its content.

Autobiographical Memory

The aspect of memory that involves the recollection of personal experiences and events.

Flashbulb Memories

Vivid, detailed memories of significant or emotional events that people often recall with a high level of clarity, as if taking a picture with a flashbulb.