Suppose that the weights per bag of cement produced by a company follow a  normal distribution. The mean weight is 40 kilograms and the standard deviation  is 0.8 kilogram. What would be the new standard deviation if the company wants  to have only 1% of the cement produced weighing less than 39 kilograms per bag  keeping the mean of 40 kilograms?

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Suppose that the weights per bag of cement produced by a company follow a 
normal distribution. The mean weight is 40 kilograms and the standard deviation 
is 0.8 kilogram. What would be the new standard deviation if the company wants 
to have only 1% of the cement produced weighing less than 39 kilograms per bag 
keeping the mean of 40 kilograms?

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