5 task

JS/index.js

+function getRandomNumber() { return Math.round(Math.random() * 99) };
+
+function showResult(arr) {
+    alert(
+        `
+            Group 0 - 9: ${arr[0]}
+            Group 10 - 19: ${arr[1]}    
+            Group 20 - 29: ${arr[2]}    
+            Group 30 - 39: ${arr[3]}    
+            Group 40 - 49: ${arr[4]}    
+            Group 50 - 59: ${arr[5]}    
+            Group 60 - 69: ${arr[6]}    
+            Group 70 - 79: ${arr[7]}    
+            Group 80 - 89: ${arr[8]}    
+            Group 90 - 99: ${arr[9]}    
+        `
+    );
+};
+
+function counterGroup(arr, num) {
+    for(let i = 0; i < num; i++) {
+        if(num >= 0 && num <= 9) {
+            arr[0]++;
+        } else if(num >= 10 && num <= 19) {
+            arr[1]++;
+        } else if(num >= 20 && num <= 29) {
+            arr[2]++;
+        } else if(num >= 30 && num <= 39) {
+            arr[3]++;
+        } else if(num >= 40 && num <= 49) {
+            arr[4]++;
+        } else if(num >= 50 && num <= 59) {
+            arr[5]++;
+        } else if(num >= 60 && num <= 69) {
+            arr[6]++;
+        } else if(num >= 70 && num <= 79) {
+            arr[7]++;
+        } else if(num >= 80 && num <= 89) {
+            arr[8]++;
+        } else if(num >= 90 && num <= 99) {
+            arr[9]++;
+        };
+    };
+};
+
+const groupArr = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0];
+
+for(let i = 0; i <= 100000; i++) {
+    counterGroup(groupArr, getRandomNumber());
+};
+
+showResult(groupArr);
\ No newline at end of file