The answer is: 1.2871428714...
Answer:
2/5m - 1/5
Step-by-step explanation:
2(1/5m - 2/5) + 3/5
= 2/5m - 4/5 + 3/5
= 2/5m - 1/5
Answer:
Step-by-step explanation:
50% is but we're working with 64 units, not 100. So, we must find a number that represents 50 but in 64 units.
If you solve for x, you get:
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