題組內容

2. (15%) Let X equal the weight in grams of a miniature candy bar. Assume that \( \mu = \text{E(X)} = 24.43 \) and \( \sigma^2 = \text{Var(X)} = 1.875 \). Let \( \bar{X} = \sum_{i=1}^{n} X_i / n \) be the sample mean of a random sample of n = 30 candy bars. Find

(2) (5%) \( \text{Var}(\overline{\text{X}}) \)