Concept explainers
(a)
To find: the mean and standard deviation for the number of heads.
(a)
Answer to Problem 38RE
Mean = 18
Standard Deviation = 3
Explanation of Solution
Given:
Formula used:
Calculation:
The chance of having a head when a coin is thrown is
The coin was thrown 36 times.
The mean sum of heads is,
Standard deviation is,
Mean = 18
Standard Deviation = 3
(b)
To find: the number of extra heads were noticed.
(b)
Answer to Problem 38RE
6
Explanation of Solution
Number of extra head would be 2 standard deviation is,
(c)
To explain: if the coin were flipped 100 times, the same number of extra heads would still be considered unusual.
(c)
Answer to Problem 38RE
10
Explanation of Solution
No number of the extra heads would be,
(d)
To calculate: in order to conclude that the findings were unusual, the number of extra heads would need to be noted.
(d)
Explanation of Solution
Given:
Calculation:
To make it unusual the number of extra head should be,
Since, 99.7% -time number of heads are in
Chapter PIV Solutions
Stats: Modeling the World Nasta Edition Grades 9-12
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