Answer:
A. E(x) = 1/n×n(n+1)/2
B. E(x²) = 1/n
Step-by-step explanation:
The n candidates for a job have been ranked 1,2,3....n. Let x be the rank of a randomly selected candidate. Therefore, the PMF of X is given as
P(x) = {1/n, x = 1,2...n}
Therefore,
Expectation of X
E(x) = summation {xP(×)}
= summation {X×1/n}
= 1/n summation{x}
= 1/n×n(n+1)/2
= n+1/2
Thus, E(x) = 1/n×n(n+1)/2
Value of E(x²)
E(x²) = summation {x²P(×)}
= summation{x²×1/n}
= 1/n
Answer:
59
Step-by-step explanation:
Answer:
76
Step-by-step explanation:
Normally you would do 76 * 0.25
For this I did 19 / 0.25
I hope this helps!
Hello there!
The larger integer is 114.
x + (x + 2) = 226
Combine like terms
2x + 2 = 226
Subtract 2 from both sides
2x = 224 Divide
x = 112
The two integers are 112 and 114. But they asked us for the lager integer. So 114 is the answer.
I hope this helps! As always, it is my pleasure to help students like you!
Answer:
The sample size is not appropriate.
The population isn’t given to be approximately normal. And for the following question, "A convenience sample of forty people is taken from a population. Which of the following is a reason why you can not make a statistical inference on the population?" The answer is The wrong sampling method was used.
