QUESTION 9 The quality assurance department at a hospital has as one of its resp

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QUESTION 9 The quality assurance department at a hospital has as one of its responsibilities the verification of medical records. One of the departments employees samples medical records and checks each one for correctness. Historial data sucgests that each medical record has a 084 probability of being correct. Suppose the employee begins checking medical records at some point in time Given that the 4th incorrect record is the 69th record checked, what is the probability that at least & of the first 98 records are incorrect?( Report answer b tree deanal places. Answer must be wthn +e 0001ofcorred vale ) QUESTION 10 The qoainy assurance cepartment at a hos tal res as o e of its respons litrs the verificaton of mediCai records. O eof the department's employees sar les edical records and checks e ach one for correctness.Hestorical data suggests that each medcal record has a 0.84 probability of being correct, Suppose the employee begins thecking medical records at some point in time Given that the 4th incorret recerd is the 726h record checked, on average, hew many incerrect records will be found in the first 102 records checked Report answer to three decimal places Answer must be within 0001 of comect au) Click Save and Subeit to sove and submit. Cick Sove All Arswers to save oil answers

Explanation / Answer

Solution:-

9) The probability that at least 6 of the first 98 records are incorrect is 0.9584.

P(Inorrect) = 0.16

Incorret record in 69 records = 4

If we check 29more records we need to find atleat 2 incorrecct records so that in total we have atleast 6 incorrect records:-

x = 2

By applying binomial distribution:-

P(x, n) = nCxpx*(1-p)(n-x)

P(x > 2) = 0.9584

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