Calculate the Expected Value, the Variance, and the Standard Deviation $\mu = E ( X ) =$

question 121

Short Answer

Calculate the expected value, the variance, and the standard deviation of the given random variable X. Please round your answers to two decimal places, if necessary.
​
​X is the number of tails that come up when a coin is tossed two times.
​ $\mu = E ( X ) =$ __________
​ $\sigma ^ { 2 } =$ __________
​ $\sigma =$ __________

---

Definitions:

Theory of Planned Behavior

A psychological theory that predicts an individual's intention to engage in a behavior at a specific time and place, based on their attitude, subjective norms, and perceived behavioral control.

Attitude-Behavior Consistency

The extent to which an individual's behaviors or actions mirror their feelings and beliefs.

Effort Justification

A phenomenon where people attribute a greater value to an outcome they had to put effort into achieving, often to reduce cognitive dissonance.

Post-Decision Dissonance

A form of regret or psychological discomfort experienced after making a challenging decision.