A housing estate of 250 people is considered to be at risk from a nearby factory on the basis of a hazard analysis which yielded the following data: (i) The 20% probability of fatalities due to the...

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A housing estate of 250 people is considered to be at risk from a nearby factory on the basis of a hazard analysis which yielded the following data:




(i) The 20% probability of fatalities due to the blast effects of an explosion.




(ii) The 10% probability of additional fatalities due to the release of toxic gas following the explosion.




(iii) The probable frequency of an explosion occurring is once in ten thousand years, i.e. 0.0001 yr-1.




QUESTIONS....




(a) Find the societal and respective average individual risks for these events.




(b) Explain why such data may be misleading if the number of people exposed to the risks is increased by, for example, the expansion of the housing estate.



Answered Same DayDec 23, 2021

Answer To: A housing estate of 250 people is considered to be at risk from a nearby factory on the basis of a...

Robert answered on Dec 23 2021
122 Votes
(a)find societal and respective average individual risk
we had probable frequancy of exposure
is 0.0001 and probability of fatality
due to the blas effect of explosion is 0.20 and due to toxic gase realease is 0.10.
Here there are two cases(1) blast and(2 ) toxic gas release. and for each case
fatality occurs and not occur. frequancy estate for the four incident outcome
cases is for each out come and for each case it will be
Average individual risk :



Here,IR is product of frequancy(Fi)and probability(Pi) of occurence foreach casei ,
n is nomber of incidence and Fi is frequancy.Here F1= ...
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