3 . The weights W kg of a group of newborn babies in a hospital are normally distributed with a mean 3.1kg and standard deviation 0.915 kg . A newborn baby is said to be overweight if the baby weighs more than that 8.7 % of newborn babies are overweight .
( a ) Find m . m kg . It is given
( b ) A newborn baby is classified as overweight . Find the probability that the baby weighs at least 4.5 kg .
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