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Thread: Trouble solving a simple question of statistics.

  1. #1
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    Trouble solving a simple question of statistics.

    Q1.
    What is the area under the standard normal curve between z = -1.28 and z = 1.28? (4dp)

    What is the z-value that gives the left hand tail area equal to 0.0102? (2dp)
    What is the absolute value of z such that the total area under the standard normal curve between z and +z will be 0.7924? (2dp)


    Q2.

    The daily exchange rates for the two-year period 2011 to 2013 between the Japanese Yen (JPY) and the Australian Dollar (AUD) can be modelled by a Normal distribution with mean , μ = 80 Yen and a standard deviation , σ = 20 Yen.


    • What is the probability that on a randomly selected day during this period, the dollar was worth less than 97 Yen? (4 dp) Answer
    • What proportion of the days during this period will the dollar be worth between 64 and 97 Yen? (4 dp)Answer
    • If you select a window of 175 days during this period, how many days would you expect the dollar to worth between 64 and 97 Yen?
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  2. #2
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    Re: Trouble solving a simple question of statistics.

    Have you tried anything?
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