question_answer 1)

From a lot of 30 bulbs which includes 6 defectives, a sample of 4 bulbs is drawn at random with replacement. Find the probability distribution of the number of defective bulbs. 

Answer:

Total bulbs = 30       Number of Defective bulbs = 6       Number of Non defective bulbs = 30 ? 6 = 24.        probability of getting a defective bulb,                   Let X is the random variable of ?Number of defective bulbs?                   P(X = 1)                   P(X =2)                         P(X = 3)                         Probability distribution is