4.49 A company sells LED bulbs in packages of 20 for $25. From past records, it knows that a bulb will be defective with probability 0.01. The company agrees to pay a full refund if a customer finds more than 1 defective bulb in a pack. If the company sells 100 packs, how much should it expect to refund? Theoretical Exercises 4.8 Find the first three moments and the variance of a random variable X with distribution P{X = i} = 10 i = 1,2,3,4