import java.io.*
 
fun main() {
    val reader = BufferedReader(InputStreamReader(System.`in`))
    val writer = BufferedWriter(OutputStreamWriter(System.out))
 
    val count = reader.readLine()!!.toInt()
    for(group in 1..count) {
    	if(group != 1) {
    		writer.write("\n")
    	}
        val input = reader.readLine()!!.split(" ")
        val memberCount = input[0].toInt()
 
        var average = 0.0
        for(i in 1..memberCount) {
            average += (input[i].toDouble() / memberCount.toDouble())
        }
 
        var honorStudentCount = 0
        for(i in 1..memberCount) {
            if(input[i].toInt() > average) {
                honorStudentCount++
            }
 
        }
 
        val rate = String.format("%.3f", (honorStudentCount.toDouble()/memberCount.toDouble())*100)
        writer.write("$rate%")
    }
 
    writer.flush()
    writer.close()
}

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

NQo1IDUwIDUwIDcwIDgwIDEwMAo3IDEwMCA5NSA5MCA4MCA3MCA2MCA1MAozIDcwIDkwIDgwCjMgNzAgOTAgODEKOSAxMDAgOTkgOTggOTcgOTYgOTUgOTQgOTMgOTE=

5
5 50 50 70 80 100
7 100 95 90 80 70 60 50
3 70 90 80
3 70 90 81
9 100 99 98 97 96 95 94 93 91