On a particular production line, the likelihood that a light bulb is defective is 5%. Ten light bulbs are randomly selected. What are the mean and variance of the number of defective bulbs? 0.475 and 0.475 0.475 and 0.6892 0.50 and 0.475 0.50 and 0.6892 The mean and the variance of a binomial random variable are calculated as u = np and o? = npq respectively. !!