Question 1172800
{{{graph(300,300,35,65,-1/30,1/2,(1/30))}}}
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the ordinate is at 1/30.
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-CDF is F(x)=(x-35)/30 for 35 <= x <x 65
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Probability between 40 and 50 is 10, the difference divided by 35, or 2/7.
-mean age is  (a+b)/2=100/2=50