[Nexus]

const numbers = [];

let sum = 0,
    lessThan50 = 0;

for (let i = 0; i < 37; i++) {
    const number = Math.floor(Math.random() * 150);// random number 0..150
    
    sum += number;
    
    if (number < 50 && (number % 12) === 0) {
        lessThan50++;
    }
    
    numbers.push(number);
}

const pre = document.createElement('pre');

pre.innerHTML += `Numbers: ${numbers.join(', ')}\n`;
pre.innerHTML += `Arithmetical mean: ${(sum / numbers.length).toFixed(3)}\n`;
pre.innerHTML += `Amount of numbers less than 50 and divisible by 12 without remainder: ${lessThan50}\n`;

//document.body.appendChild(pre);
console.log(pre.innerHTML);