In a small county A, the age distributions of the population are listed below. In county A, the total number of deaths was 20.

Age group	Population
20-29	15
30-39	22
40-49	30
50-59	47
60-69	62
70-79	66
80+	45

The table shows the distributions of age-specific deaths and the number of individuals in the selected standard population

Age group	deaths	Population
20-29	900	4532
30-39	902	5001
40-49	1980	10998
50-59	2580	17201
60-69	4147	18143
70-79	4118	17160
80+	4620	11550

Please calculate and explain the SMR for county A using the information above. (note: Please create a table to show the calculations)