Use the probability distribution to complete parts (a) and (b) below. The number of defects per 1000 machine parts inspected Defects 2 3 5 Probability 0.262 0.300 0.237 0.141 0.044 0.016 (a) Find the mean, variance, and standard deviation of the probability distribution. The mean is 15 (Round to one decimal place as needed.) The variance is 1.5 (Round to one decimal place as needed.) The standard deviation is 1.2 (Round to one decimal place as needed.) (b) Interpret the results. The mean is 1.5, so the average batch of 1000 machine parts has 1 or 2 defects. The standard deviation is 1.2 , so the typical number of defects in a batch of 1000 deviates from the mean by about 1 defect (Round to one decimal place as needed.)