Mathematics

Problem

During a quality check, four factories reported the following numbers of defective bulbs: Factory

P

18

defectives out of

240

bulbs Factory

Q

21

defectives out of

300

bulbs Factory

R

16

defectives out of

220

bulbs Factory

S

12

defectives out of

180

bulbs Arrange the factories from the highest to the lowest likelihood of producing a defective bulb. a)

Q,\;P,\;R,\;S

S,\;Q,\;R,\;P

P,\;R,\;Q,\;S

P,\;Q,\;R,\;S