Question 1166856
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            You do not understand the meaning of the problem.



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The problem says that the height of waves is UNIFORMULY DISTRIBUTED between the marks 1 ft and 9 ft.


Then they ask 


(a)  What is the probability that the waves will less than 2 feet in height ?


        Less than 2 feet means that it is between 1 ft and 2 ft.

        Comparing the length of this interval [1 ft, 2 ft], which is 2-1 = 1 ft,
        with the total possible interval from 1 ft to 9 ft,
        we see that the probability is  {{{1/8}}}.



(b)  In this case, the observation is between 4 ft and 6 ft: the length of the 
     interval is 6-4 = 2 ft

      Comparing it with the total possible interval from 1 ft to 9 ft, 
      we see that the probability of such observation is  {{{2/8}}} = {{{1/4}}} .    <U>ANSWER</U>
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Solved and explained, &nbsp;patiently and carefully.