[{"collection":"collection","count":20,"content":{"key":{"type":"int","min":0,"max":10}}}]

db.collection.aggregate([{"$facet":{"stat":[{$group:{_id:null,count:{$sum:1},min:{$min:"$key"},max:{$max:"$key"},mean:{$avg:"$key"},median:{$median:{input:"$key",method:"approximate"}}}}],"mode":[{"$group":{"_id":"$key","count":{"$sum":1}}},{$sort:{count:-1}},{"$limit":1}]}}])