Probability Distributions - E(X), VAR(X)

Question 1

Problem B: What is the E(X2) ?

Accepted Answer

2.583

Question 2

Problem D: What is the standard deviation for the gambler's winnings?

Accepted Answer

72.36

Question 3

Problem B: What is the expected number of siblings for this class?

Accepted Answer

1.42

Question 4

Expected value can be a negative value?

Accepted Answer

True

Question 5

Problem B: What is the P(X ≤ 2) ?

Accepted Answer

22/24, 11/12

Question 6

Problem D: What is the E(X2) ?

Accepted Answer

5246.15

Question 7

What is the expected value the same as?

Accepted Answer

Mean

Question 8

Problem B: What is the standard deviation for the number of siblings in this class?

Accepted Answer

0.753

Question 9

Problem D: What is the gambler's expected gain?

Accepted Answer

Loss of $3.08

Question 10

How many credits is your Probability Distributions external worth?

Accepted Answer

4

Question 11

Variance can be a negative value?

Accepted Answer

False

Question 12

Problem A: What is the VAR(X) ?

Accepted Answer

851.77

Question 13

When is your Statistics external exam at the end of this year?

Accepted Answer

Monday 27 November

Question 14

Problem A: What is the P(X = 71) ?

Accepted Answer

0.14

Question 15

Problem D: What is the gambler's probability of losing?

Accepted Answer

36/52

Question 16

Problem C: What is the probability of the gambler winning his bet?

Accepted Answer

18/38

Question 17

What is the formula for calculating variance?

Accepted Answer

VAR (X) = E(X2) - [E(X)]2

Question 18

Problem D: How much does the gambler effectively gain if they choose an ace?

Accepted Answer

$70

Question 19

Problem A: What is the SD(X) ?

Accepted Answer

29.19

Question 20

Problem A: What is the E(X)?

Accepted Answer

30.9

Question 21

Problem C: What is the gambler's expected winnings?

Accepted Answer

Loss of $5.26

Questions 21