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| Math Central | Quandaries & Queries |
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Question from ROGI, a teacher: major hiring in retail in BRITAIN,ACCORDING TO MORE IN STORE ARE ASFOLLOWS:9,000 AT SAFEWAY; 5000 AT BOOTS; 3400 AT DEBENHAM; AND 1700 AT MARKS AND SPENCER. WHAT IS PROBABILITY THAT THE A RANDOMLY SELECTED NEW HIRE FROM THESE WAS HIRED BY MARKS AND SPENCER? |
Rogi,
There are 9,000 + 5,000 + 3,400 + 1,700 = 19,100 new hires in total. If you randomly select a new hire then every one of the new hires has the same probability of being selected, 1/19,100. Since 1,700 of the new hires are by Marks and Spencer the probability that the ne hire you select is from Marks and Spencer is 1,700/19,100 = 17/191.
I hope this helps,
Penny
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