I'm guessing you're looking for the mean or average? That would be the sum of all the ages divided by the numbers of people
So:
19+8+21+19=67
Divided by 4
67/4= 16.75
Rounded up you get 17
Answer:
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It's a question on recognizing place value.
In the figure 418,832, the digit 1 takes the place value of ten thousand (10,000).
The following number is 8, greater than 5 so it is rounded up.
Therefore, to the nearest ten thousand, we have: 420,000
The mean increases by two.
15+23+24+26+27+35 = 140
140/6 = 23.3
23+24+26+27 = 100
100/4 = 25
The mean roughly increases by 2.
