A probability<span> density function is an </span>equation used to compute probabilities of continuous random variables<span>.</span>
So, 672 miles divided by 56 miles per hour = 12 hours
5/7 (weight) = 40.5
Multiply each side of the equation by 7 :
5 (weight) = 283.5
Divide each side by 5 :
<em>Weight = 56.7 pounds</em>
Check: 5/7 times 56.7 = 40.5 yay!