After a number of complaints about its directory assistance, a telephone company examined samples of calls to determine the frequency of wrong numbers given to callers. Each of the 8 samples consisted of 110 calls.
7 2 6 10
2 7 4 2
Calculate p¯ (Keep five decimal places in your answer)
Expert Answer
Pbar = Average proportion of wrong numbers given to callers
Total number of calls = 110 calls/ sample x 8 samples = 880 calls
Total number of wrong numbers given to callers = 7 + 2 + 6 + 10 + 2 + 7 + 4 + 2 = 40
Hence, average proportion of wrong numbers given
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