The answer is 919. Simply add the numbers together arithmetically as you would for the problem two plus two. To check your work, a calculator is the best option.
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419 ÷ 2 = 209.5
'Range' is the difference between the lowest datum and the highest. When dealing with a set of data, it is often convenient to first arrange the datum from lowest to highest: 149, 247, 327, 470, 498, 562, 568 The range is 568 minus 149, or 419.
8.9149
19.0455
209.5