String data = "(1) 1.034 (2) 33.7 (3) 33.1 (4) 31.8 (5) 30.1 (6) 33.2 (7) 33.4 (8) 48.7 (9) 36.6 (10) 35.7";
        String[] parts = data.split(" ");
        double total = 0;
        if (parts.length > 1) {
            for(int i = 1; i < parts.length; i++) {
                if (i % 2 != 0) {
                    String temp = parts[i];
                    try {
                        double val = Double.parseDouble(temp);
                        total += val;
                    } catch(NumberFormatException e) {
                        e.printStackTrace(); // Not a number...
                    }
                }
            }
        }
        double mean = (total == 0 ? 0 : total / (parts.length / 2));
        System.out.println(mean);