Kata

My grandfather always predicted how old people would get, and right before he passed away he revealed his secret!

In honor of my grandfather's memory we will write a function using his formula!

• Take a list of ages when each of your great-grandparent died.
• Multiply each number by itself.
• Add them all together.
• Take the square root of the result.
• Divide by two.

Example

predictAge(65, 60, 75, 55, 60, 63, 64, 45) === 86

predict_age(65, 60, 75, 55, 60, 63, 64, 45) == 86

predict_age(65, 60, 75, 55, 60, 63, 64, 45) == 86

predict_age(65, 60, 75, 55, 60, 63, 64, 45) == 86

predict_age(65, 60, 75, 55, 60, 63, 64, 45) == 86

predictAge(65, 60, 75, 55, 60, 63, 64, 45) == 86

predictAge(65, 60, 75, 55, 60, 63, 64, 45) == 86

predictAge(65, 60, 75, 55, 60, 63, 64, 45) == 86

Predicter.predictAge(65, 60, 75, 55, 60, 63, 64, 45) == 86

Note: the result should be rounded down to the nearest integer.

Some random tests might fail due to a bug in the JavaScript implementation. Simply resubmit if that happens to you.