A) range = range; That is, from 42 to 73 years old; If you put 40 in, it is 40 to 73, and the range of values is changed from 42 to 73 to 40 to 73, that is, from 3 1 to 33, which is an increase.
B) median = median; The median of 42 to 73 is the sixth value, and the sixth value is 58; If you put in 40, the median is the middle value between the sixth and seventh numbers, the sixth value is 58, and the seventh value is 58; The median is 58; As before, it's not the answer.
C) mean = mean; The average value of 1 1 is 57.45; If you add 40, the average is 56, which is lower than the previous 57.45. This is not the answer.
D) mode = mode; That is, the number that appears the most times is 58, which appears three times; If you add 40, the most common number is 58, as before, not the answer.
E) Intermediate range = number of intermediate ranges; That is, the average of the maximum value and the minimum value, the maximum value is 73, the minimum value is 42, and the median value is 57.5; Plus 40, the maximum number is 73, the minimum number is 40, and the medium-range number is 56.5, which is lower than the previous 57.5, which is not the answer.
So the answer is (a), the range has increased, from 42 to 73(3 1) to 40 to 73(33).