Concept explainers
To find: the standard deviation of the amount that may win drawing a card.
Answer to Problem 11E
$5.44
Explanation of Solution
Formula used:
Calculation:
Suppose that
R = getting a red card
S = Getting a spade
C = getting a club
A = getting. Ace of club
There are 26 red cards, 13 spades and 13 clubs, 1 ace of club
Probability model of random variable
R | S | C | A | |
X | $0 | $5 | $10 | $30 |
P(X= x) |
The expected value of X is
Expected amount is $4.13
Find the variance
The standard deviation of X is,
Therefore, the standard deviation of X is $5.44
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Stats: Modeling the World Nasta Edition Grades 9-12
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