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2016-02-03T15:59:12+05:30

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Average atomic mass=55/100 * 79 + 45/100 * 81
average atomic mass= 4345/100 + 3645/100
average atomic mass= 4345+3645/100
average atomic mass= 7990/100
average atomic mass=79.90%
Therefore the average atomic mass of bromine atom= 79.9%
i hope it helps...
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thanx 
today I was having exam and this question was asked for 1 mark
ohkk
I was not sure about my answer
oh ...but now i hope u r sure ...