need an explanations please Thanls in advance 4· (20 pts.; 5 points ea) Civil en

Question

need an explanations please

Thanls in advance

4· (20 pts.; 5 points ea) Civil engineers must monitor the flow on rivers where power is generated following are the daily mean flow rates in millions of gallons per day (MGD) on a certain river dur the month of May for 50 years. Refer to the histogram and answer the following. Flow, millions of gallons (MGD) a) Given the histogram above, the best statement that can be made is (place an X beside your answer): a. The maximum recorded flowrate was measured for 8 years b. A flow rate of between 1125 and 1175 MGD occurred most frequently. c. A flow rate of between 1125 and 1175 MGD was the highest recorded flowrate d. None of these apply b) What percentage of recorded MGD by year occurred between 525 and 675? c) What percentage of recorded MGD by year occurred was less than 625 MGD? d) If an average flow rate of greater than 825 MGD indicates that the dam controlling the flow rat be breached, what percentage of recorded MGD by year meet that threshold?

Explanation / Answer

a) option C is correct :as from above graph ; maximum recorded flowrate is in 1150 pointed column; which falls between 11125 and 1175

b)

here total frquency =50

and frequency beteen 525 and 675 =2+8+7=17

therfore % =(17/50)*100=34%

c)

less than 625 frequency =4+4+6+2+8=24

hence % =(24/50)*100=48%

d)

frequency greater than 825 =2+3+1+1+2=9

hence 5 =(9/50)*100 =18%

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