8. (10%) Let denote the mean of a random sample of size 128 from a gamma distribution with a = 2 and β = 4. ApproximateP(7＜＜9).

3. (10%) Suppose we are playing draw poker. We are dealt (from a well shuffled deck) 5 cards which contain 4 spades and another card of a different suite. We decide to discard the card of a different suite and draw one card from the remaining cards to complete a flush in spades (all 5 cards spades). Determine the probability of completing the flush.