An electrician purchases 64 light bulbs from a store. During installation, he finds that only 56 bulbs work properly. Calculate the percentage of defective bulbs.

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

A portable lamp has 8 batteries, 3 of which are defective. If 2 are selected at random with replacement, find the probability that both are defective. Round your answer to two decimal places.

A box contains 5 defective and 10 non-defective lamps. Eight lamps are drawn at random insuccession without replacement. What is the probability that the 8th lamp is the 5th defective?

Last year, a lighting supplier called Bright Idea shipped a total of 9500 lamps to its distributors. This year, the supplier shipped 72% more than that. How many lamps did Bright Idea ship this year?

47,322 bulbs are to be packed in several boxes. Each box should contain equal numbers of bulbs and no bulb should be left  unpacked. Number of boxes used can be:1411128