Explain the steps involved in determining the expected value of a random variable that follows a basic distribution. Additionally, how would you go about constructing a confidence interval for this value?

Interview question asked to Data Scientists interviewing at Mollie, Uber, Quora and other companies. Original question asked: Explain the steps involved in determining the expected value of a random variable that follows a basic distribution. Additionally, how would you go about constructing a confidence interval for this value?.