Summary of Human Life
in Terms of Random Variables
Discrete Random Variables:
1 Gender
of an individual at the time of birth
2 No
of time he/she falls sick in his/her entire lifetime
3 No
of children born by him/her in the entire lifetime
4 No
of girls born among the total children born
5 No
of jobs changed in his/her entire lifetime
Continuous Random Variables:
1 Time
of birth of an individual
2 Time
of illness
3 Time
between two consecutive illnesses
4 Time
of recovery from illness
5 Time
of marriage
6 Time
of birth of children
7 Time
between two consecutive births
8 Age
at the time of death
In all these events memory plays
an important role. For example the time between two consecutive births is at
least 9 months. The probability of time of second attack of severe illness is
the highest when this time is closer to the time of recovery from first illness.
This is due to the probability of relapse of a disease. So failure rate or
force of mortality is affected by memory. Failure rate is higher for very old ages
and very young ages. But this is not
true in the case of electronic devices, batteries etc. This will be discussed tomorrow in the discussion
on reliability theory.
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