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How are we to calculate the arithmetic mean age for the data?
Age
(in completed years) Number of members
10 till19 ----------------------------- 185
20 till 29 ----------------------------- 263
30 till 39 ----------------------------- 325
40 till 49 ----------------------------- 442
50 till 59 ----------------------------- 368
60 till 69 ----------------------------- 134
70 and over -------------------------- 83
1 Answer
- TonyLv 68 years agoFavorite Answer
It cannot be calculated.
Typically, to calculate the mean age, you take the midpoint of the interval and multiply it by the number of people to get the sum of that catagory. You then add up all the sums, and divide by the total number of people.
You data is "fine" until you get to the last catagory. Since it is open ended, you cannot find the mid point, therefore you cannot compute the mean.
You CAN compute the median.
always,
tony