Question

# After a number of complaints about its directory assistance, a telephone company examined samples of calls...

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 131 calls.

 6 5 7 10 5 5 7 5

P- bar = Average proportion of wrong numbers given to callers

Total number of calls = 131*8 = 1048

Total number of wrong numbers given to callers = 6+5+7+10+5+5+7+5 = 50

Hence,

p - bar = 50/1048 = 0.04771

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