Q&A Part 3 Q3.7 answer error

Discussion in 'SP9' started by ALEX_AK, Mar 29, 2018.

  1. ALEX_AK

    ALEX_AK Member

    z1 and z2 calculated are not correct.

    Below should be the correct answer.
    z1 = 0.38235
    z2 = 0.562612
     
    ALEX_AK, Mar 29, 2018
    #1
  2. Simon James

    Simon James ActEd Tutor Staff Member

    Hi. They are correct. Make sure you are working in RAD and LN
     
    Simon James, Mar 29, 2018
    #2
  3. ALEX_AK

    ALEX_AK Member

    Hi Simon, thanks a lot.
    I googled a bit on this and usually log is understood as log base 10.
    Didn't realized that it was actually LN in the formula. I can derive the answer given in the Q&A now.
    Its not too clear in the readings and also in the Actuarial formula booklet on this.
     
    ALEX_AK, Mar 29, 2018
    #3
  4. Simon James

    Simon James ActEd Tutor Staff Member

    Log is used to refer to both base 10 and base e.
    In the Actuarial Tables it is stated on page 1 of the yellow formula pages that "log" refers to base e (ie ln)
     
    Simon James, Mar 29, 2018
    #4
  5. ALEX_AK

    ALEX_AK Member

    Didn’t realised that. Thanks a lot :)
     
    ALEX_AK, Mar 30, 2018
    #5
    Simon James likes this.

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