Directions (1 - 4): The following table show the world production of steel in 1920 - 1927. Study the table and answer the questions.
Year Production (in million tons)
1920 71.30
1921 43.51
1922 67.66
1923 76.23
1924 77.23
1925 88.93
1926 91.75
1927 100.17

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1.
The average production of steel is:

2.
The difference of the production of steel in the year 1923 and 1924 is x% of 1927. Then the value of x approximately.

3.
The ratio of production of steel in the year 1924 and 1925 to that of 1923 and 1927 is:

4.
The number of years during which the company has its production less than the average production during 1920 - 1927 is approximately.