A quality inspector selects a sample of 12 items at random from a collection of 60 items, of which 18 have excellent quality, 25 have good quality, 12 have poor quality and 5 are defective.

What is the probability that the sample only contains items that have either excellent or good quality?

Question

A quality inspector selects a sample of 12 items at random from a collection of 60 items, of which 18 have excellent quality, 25 have good quality, 12 have poor quality and 5 are defective.  

What is the probability that the sample only contains items that have either excellent or good quality?

anonymous · Answer

18+25+12+5 = Total Sum of items

anonymous · Answer

Totals number of items is 60

anonymous · Answer

18+25 is good or excellent quality so thats 43/60 that fir the quality quota

anonymous · Answer

(43/60)^12 = the asnwer

anonymous · Answer

12 times picked at 43/60 chances

anonymous · Answer

Actually sorry, not 43/60^12

anonymous · Answer

43/60+42/59+41/58 etc etc

anonymous · Answer

multiply them not add tho. geez my answer is dirty lol

anonymous · Answer

lemme know if u understood what i meant if not ill type it out neatly

anonymous · Answer

8.334