There are 5290 children in a study. There are 2560 boys and 2730 girls. Of the 2560 boys, there are 432 five year olds, 379 six year olds, 501 seven year olds, 410 eight year olds, 420 nine year olds, 418 ten year olds. Of the 2730 girls, there are 408 five year olds, 513 six year olds, 412 seven year olds, 436 eight year olds, 461 nine year olds, 500 ten year olds. Of the whole population of boy and girls, there are 840 five year olds, 892 six year olds, 913 seven year olds, 846 eight year olds, 881 nine year olds, 918 ten year olds. What is the probability of selecting a girl among all those who are 5, 6, or 7 years old?
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