按独占范围类型分组的最佳方式是什么。考虑以下几点。

CREATE EXTENSION IF NOT EXISTS btree_gist;
create table if not exists ranges (
    "id" uuid NOT NULL DEFAULT uuid_generate_v4(),
    "name" character varying NOT NULL,
    "range" numrange NOT NULL,
    EXCLUDE USING gist (range WITH &&)
);
create table if not exists customers (
    "id" uuid NOT NULL DEFAULT uuid_generate_v4(),
    "name" character varying NOT NULL,
    "score" integer NOT NULL
)
insert into ranges (name, range) VALUES ('awesome', '[75,)'::numrange);
insert into ranges (name, range) VALUES ('good', '[50,75)'::numrange);
insert into ranges (name, range) VALUES ('ok', '[25,50)'::numrange);
insert into ranges (name, range) VALUES ('bad', '[,25)'::numrange);
insert into customers (name, score) VALUES ('A', 10);
insert into customers (name, score) VALUES ('B', 10);
insert into customers (name, score) VALUES ('C', 80);

我想要一个将返回以下内容的查询。。。

| range name | count of customers in range |
  | 'awesome'  | 1                           |
  | 'bad'      | 2                           |

我不知道如何做到这一点。希望能得到一些指导
谢谢！！
（注：第12页）