Answer:
Step-by-step explanation:
Given that X is the number of months between successive payments
Cumulative distribution function of X is

a) PMF of x would be

b) 
Answer:
Option b) is correct.
The completed factor of given expression is 
Step-by-step explanation:
Given expression is 
To find the completed factor for the given expression:
:
Taking the common number "2" outside to the above expression we get

Now rewritting the above expression as below
(since 16 can be written as the number 2 to the power of 4)

The above expression is of the form 
Here
and 
Therefore it becomes

The above expression is of the form 
Here
and 
Therefore it becomes
Therefore
Option b) is correct.
The completed factor of given expression is 
Answer:
If he gave 1 part to his friend then he will have 3 parts left. Is that what you needed help on?