Suppose that in one town,50-year old men have a mean weight of 80 kg with a standard deviation of 7 kg.30-year old men have a mean weight of 71 kg with a standard deviation of 6 kg.How much heavier do you expect a 50-year old man to be than a 30-year old man and what is the standard deviation of this difference?
A)80 kg,7 kg
B)9 kg,3.61 kg
C)151 kg,4.31 kg
D)9 kg,9.22 kg
E)9 kg,13 kg

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The Answer of Suppose that in one town,50-year old men have a mean weight of 80 kg with a standard deviation of 7 kg.30-year old men have a mean weight of 71 kg with a standard deviation of 6 kg.How much heavier do you expect a 50-year old man to be than a 30-year old man and what is the standard deviation of this difference?
A)80 kg,7 kg
B)9 kg,3.61 kg
C)151 kg,4.31 kg
D)9 kg,9.22 kg
E)9 kg,13 kg

Suppose That in One Town,50-Year Old Men Have a Mean