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math word problem (sorry it is kind of a lot)
The construction of the American railroad system is one of the country's greatest technological achievements. Between the years 18401890, about 161,200 miles of track were built, literally "paving the way" for economic progress and land expansion. The table shows the miles of railroad track built from the years 18551866.
Year:1855  1856  1857  1858  1859  1860  1861  1862  1863  1864  1865  1866
Miles of track built: 1654  3642  2487  2465  1821  1846  651  834  1050  738  1177  1716
a. Make a cumulative frequency table representing the miles of track built. Use intervals of 1000.
b. In what percent of years were fewer than 2000 miles of track built per year? Explain how you know.
c. To the nearest mile, what was the mean number of miles of track built per year for the years 18551866?
d. Compare your answer from Part b to the average you found in Part c. Does the answer from Part c make sense? Explain.
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 ANSWER

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