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The weights of a population of 15-year old boys are approximately normally distributed with mean 58.9 kg and standard deviation 5.8 kg. (a) What proportion

The weights of a population of 15-year old boys are approximately normally distributed with mean 58.9 kg and standard deviation 5.8 kg.

(a) What proportion of these boys weigh between 50 kg and 62 kg?

(b) What is the chance that one of these boys, chosen at random, would weigh over 68 kg?

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