To sketch:The graph of the derivative function and which year has negative derivative.
Between 1960 and 1965/1966.
Given:The graph shows the average age of first marriage of Japanese men varied in the last half of the 20th centaury.
It is given that the graph which shows the average age of first marriage of Japanese men varies.
Graph of the derivative function in that year derivative is negative is given below
Therefore, the exact years in which the derivative is negative, it’s between 1960 and 1965/1966.
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