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A die is thrown 100 times; 'even number' is success. The standard deviation of the number of successes is:
A$\sqrt{50}$ ≈ 7.07
B5
C25
D10
Answer & Solution
Correct answer: B. 5
$p = 1/2, q = 1/2, n = 100$. $SD = \sqrt{npq} = \sqrt{100 \cdot 1/2 \cdot 1/2} = \sqrt{25} = 5$.
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