Answer: 0.0473
Step-by-step explanation:
Given : The proportion of gambling addicts : p=0.30
Let x be the binomial variable that represents the number of persons are gambling addicts.
with parameter p=0.30 , n= 10
Using Binomial formula ,

The required probability = 
Hence, the required probability = 0.0473
On the 4th stage, 81 friends will be called to be told of the news
It is the same beacuse x is equal to y so x and y both equal 22
A proper fraction is a fraction less than one, with the numerator less than the denominator so 1/2 is your answer