Calculate the average of the numbers in an array of numbers. The array: [2, 5, 17, 81, 9].

Solution

Explanation

How to calculate an average

A calculated „central“ value of a set of numbers.

To calculate it: add up all the numbers, then divide by how many numbers there are.

Example: what is the average of 2, 7 and 9? Add the numbers: 2 + 7 + 9 = 18 Divide by how many numbers (i.e. we added 3 numbers): 18 ÷ 3 = 6 So the average is 6

(Also called the Arithmetic Mean.)

Accomplishing our Goal

To accomplish our task, we create a function called averageArray() and pass in our array.

We need to get the length of the array for our for-loop. Creating a sum and then dividing by the length gets our average.

Just return the number and print it to the console, and you are done!

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Calculate the sum of odd numbers greater than 9 and less than 30 a for-loop .

Solution

Explanation

To accomplish our task, we should remember challenge #02 because back then, the task was to print out every odd number below 99. That means we create a for loop with an increment of 2 after each iteration to get only odd numbers when starting with an odd number. In our case with 11.

Remembering challenge #05 makes us also happy again. There we had the task to create the sum of the numbers from 1 to 24. The same concept applies to this task. We add up every odd number above 9 and below 30 to a sum.

After the loop has finished, we print it out to the console:

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