MATH103 April 2017
• Q1 (a) • Q1 (b) • Q1 (c) • Q1 (d) • Q1 (e) (i) • Q1 (e) (ii) • Q1 (e) (iii) • Q1 (f) • Q2 (a) • Q2 (b) (i) • Q2 (b) (ii) • Q2 (c) • Q3 (a) • Q3 (b) • Q3 (c) • Q3 (d) • Q4 • Q5 • Q6 (a) • Q6 (b) • Q7 (a) • Q7 (b) • Q7 (c) • Q8 (a) • Q8 (b) • Q8 (c) • Q9 (a) • Q9 (b) • Q9 (c) • Q9 (d) • Q9 (e) •
Question 09 (a)
The probability density function (pdf ) for the mortality of a jellyfish (Turritopsis dohrnii),
, at age is given by
(a) Find the probability, , that a jellyfish dies before reaching the age .
Make sure you understand the problem fully: What is the question asking you to do? Are there specific conditions or constraints that you should take note of? How will you know if your answer is correct from your work only? Can you rephrase the question in your own words in a way that makes sense to you?
If you are stuck, check the hint below. Consider it for a while. Does it give you a new idea on how to approach the problem? If so, try it!
The probability that a jellyfish dies before reaching the age is equal to the probability that a jellyfish dies at time for some satisfying .
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The desired probability is
To calculate this integral, use the Fundamental Theorem of Calculus with the fact that
The last equality follows from the fact that . So, the answer is .