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Recent content by Lee Qian Yi

  1. L

    Mathematics: Post your doubts here!

    Why?
  2. L

    Mathematics: Post your doubts here!

    Why ?
  3. L

    Mathematics: Post your doubts here!

    A die is biased so that the probability that is shows a six on any throw is p. The experiment is repeated and another 97% confidence interval is found. Find the probability that exactly one of two confidence intervals includes the true value of p. ANS :0.0582 How to do ?
  4. L

    Chemistry: Post your doubts here!

    Calculate the pH of the buffer formed when 10 cm3 of 0.1 m0ldm-3 NaOH is added to 10 cm3 of 0.25 moldm-3 CH3COOH, whose pKa=4.76 ANS : pH=4.58 How to calculate ? I know that need to use this formula pH= pKa + log ( conc. salt / conc. acid ) , but how to find the conc. of both solvents ?
  5. L

    Mathematics: Post your doubts here!

    P(x) = 2x^3-3x^2+5x-2 . It is given that (2x-1) is a factor of p(x) and that when p(x) is divided by (x-2) the remainder is 12 . Find the quadratic factor of p(x). ANS:x^2 – x + 2
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    Mathematics: Post your doubts here!

    Get it thx
  7. L

    Mathematics: Post your doubts here!

    Approximation Poisson Distribution X~N ( 520, 0.008 ) Find the smallest value of n if P( X= n) > P ( X = n+1) ANS : 4 How to find ? Solution pls.
  8. L

    Chemistry: Post your doubts here!

    Apply alcohol may also be converted into propanol by using a ruthenium (IV) catalyst in water. CH2=CHCH2OH-> CH3CH2CHO Suggest what is unusual about this single step ? ANS : DISPROPORTINATION HAS TAKEN PLACE How can I know that ? Anyone can explain?
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    A level Biology: Post your doubts here!

    oh ok thx
  10. L

    A level Biology: Post your doubts here!

    Interphase has 886 number of cells , prophase has 73 number of cells , metaphase has 16 number of cells , anaphase has 14 number of cells and telophase has 11 number of cells . What percentage of cells contain chromosomes that appears as two chromatids ? ANS:8.9%. Anyone can explain how to do ?
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    Chemistry: Post your doubts here!

    ok ok thx
  12. L

    Chemistry: Post your doubts here!

    1) In an experiment 12.0dm3 of oxygen measured under room conditions is used to burn completely 0.10mol of propan-1-ol. What is the final volume of gas measured at room conditions? ANS: 8.40dm3 Anyone can explain?
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    Chemistry: Post your doubts here!

    oh oh i see , really thx very much !!
  14. L

    Chemistry: Post your doubts here!

    can explain why answer is D?
  15. L

    Mathematics: Post your doubts here!

    Oh i see thx
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