How to predict average?

[smachs]

how can I predict the average value of an amount of data in an array?

For example i am use real currency using all the data in an array

var balance = [
    '1,98',
    '10,50',
    '500,47',
    '5.000,64',
    '5.206,64',
    '5.778,03',
    '70.000,29',
    '900.000,16',
   '1.000.000,07'
]

How can I predict that the average balance is 5k and corresponds to 70% of the total of all the array?

I was looking at some examples and in the below it can predict what will be the next number of the array in order of 0 to 9

            var my_data = [
                0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10,
                0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10,
                0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10,
                0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10,
                0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10,
                0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10,
                0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10,
                0, 1, 2, 3, 4, 5, 6, 7, 8
            ];

            var trainer = new convnetjs.SGDTrainer(net, { learning_rate: 0.01, momentum: 0.2, batch_size: 1, l2_decay: 0.001 });

            var learn = function () {
                for (var j = 0; j < 100; j++) {
                    for (var i = 0; i < my_data.length - d; i++) {
                        var data = my_data.slice(i, i + d);
                        var real_value = [my_data[i + d]];
                        var x = new convnetjs.Vol(data);
                        trainer.train(x, real_value);
                        var predicted_values = net.forward(x);
                        console.log("data: [" + data + "] -> value: " + real_value);
                        console.log("prediction in learn stage is: " + predicted_values.w[0]);
                    }
                }

            }

            var predict = function (data) {
                var x = new convnetjs.Vol(data);
                var predicted_value = net.forward(x);
                return predicted_value.w[0];
            }

            learn();
            var item = [0, 1, 2, 3, 4, 5, 6, 7, 8];
            console.log("predicted value for [" + item + "] is: " + predict(item));

is it possible to learn deeply to predict the average values of an array?

Thanks a lot for the help 👍