1 the random variable x represents the number of persons in a singapor
1. The random variable X represents the number of persons in a Singapore family chosen at random and has the
following probability distribution:
(i)  The average family size in Singapore (do not round answer)
(ii)  The standard deviation of the number of persons in a Singapore family is
(iii)  In any randomly selected Singapore family, the probability that X is at most 3 is
(iv)  If a Singapore family has at most 3 persons, the probability that there are exactly 2 persons is
(v)  What is the probability that 2 randomly selected Singapore families will have at least 10 people in total?
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