Random function with break command in Python

1. 
   

   Write a function that accepts 3 numbers and calculates the average of the 3 numbers and raises the average to the second power (returns the average squared).

   
   


2. 
   

   Write a loop that finds 3 random uniform numbers (0 to 1); sends the 3 numbers to the function and stops the loop when the value of the function is greater than 0.5625

   
   

I tried to figure out this 2 things but I am confused a little bit.

import random 

a = random.random ()
b = random.random ()
c = random.random ()

def avenum(x1,x2,x3):   # the average of the 3 numbers
    z = (x1+x2+x3)/3.0 
    return z

y = avenum(a,b,c)

print 'the average of the 3 numbers = ',y


def avesec(x1,x2,x3):   # the average of the second power
    d = ((x1**2)+(x2**2)+(x3**2))/3.0 
    return d

y1 = avesec(a,b,c)

print 'the average of the second power = ',y1