Has the marrying age of a man changed over the years? the united states bureau of the census takes a formal count of everyone in the u. s. every 10 years and has provided the following data that gives the median age of an american man at the time of his first marriage.
year
1910
1920
1930
1940
1950
1960
1970
1980
1990
2000
median age
25.1
24.6
24.3
24.3
22.8
22.8
23.2
24.7
26.1
26.8
is the average rate of change zero over any ten-year period? if so, when?

In the year 1930-1940 and in the year 1950-1960 the average rate of change over a ten year period is zero.

Step-by-step explanation:

The average rate of change is given as:

Ratio of change in the median ages to the change in the number of years.

As the gap between the two years is 10 years.

so the average rate will be zero when the median ages are same in the that year and the previous year.

and such a condition is seen in the year:

1930-1940  ( since the median ages are same in both the years i.e. 24.3).

and 1950-1960  ( since  the median ages are same in both the years i.e. 22.8)

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step-by-step explanation:

you answer is a

step-by-step explanation: