3/4=x/60 so you divide 60 by 4 and get 15x3=45/60
PAr is the correct answer
Question:
The n candidates for a job have been ranked 1, 2, 3,..., n. Let x = rank of a randomly selected candidate, so that x has pmf:
(this is called the discrete uniform distribution).
Compute E(X) and V(X) using the shortcut formula.
[Hint: The sum of the first n positive integers is , whereas the sum of their squares is
Answer:
or
Step-by-step explanation:
Given
PMF
Required
Determine the E(x) and Var(x)
E(x) is calculated as:
This gives:
From the hint given:
So:
Var(x) is calculated as:
Calculating:
Using the hint given:
So:
So:
Take LCM
Apply difference of two squares
Answer:
A= 49.8
B= 18.5
C= 36
D= 32
Step-by-step explanation:
A= 180-130.2= 49.8
B= 90-71.5=18.5
C= 90-54=36
D= 113+35=148
180-148=32
-14 from both sides then divide both sides by 1/3
s=36