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    Ho: u =74914
    H1: u =/=74914

    std dev = 14 530
    sqample size = 112

    A 10 year old survey found that the average netincome for senior chartered accountants was £74,914. Aresearcher wants to determine whether this figure has changedand takes a random sample of 112 senior charteredaccountants. Assume the population standard deviation of netincomes for senior chartered accountants is £14,530.

    from this how do you find X bar?

    example says its £78,695 but i dont know how they got it.

    any help would be great


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