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**dolkam** Sorry, but this is too difficult. I need to work on my calculator, but I am not confident how:

The weights, in kg, of men in a random sample from a given population can be modelled by a normal distribution with mean 83.5 and 16.8.

a) What is the value above which 20% of the weights of men from the population will lie?

b) What is the range of values, symmetric about the mean, within which approx 95% of the weights of men will lie?

c) What is the percentage of weights of men above 100 kg.