In testing a new drug, researchers found that 25% of all patients using it will have a mild side effect. A random sample of 16 patients using the drug is selected. Find the probability that more than 7 patients will have this mild side effect.

The probability that more than 7 patients will have this mild side effect is ___. (Round to three decimal places as needed.)

Answer:
Given:

Probability of success $(p)=0.25$

Sample size $(n)=16$

Solution:
The probability that more than 7 patients will have this mild side effect:
$$ \text{P}(x > 7) = \sum_{8}^{16} \binom{n}{x} \cdot p^x \cdot (1-p)^{n-x} $$ $$ = \sum_{8}^{16} \binom{16}{x} \cdot 0.25^x \cdot (1-0.25)^{16-x} $$ $$ = 0.0271 $$

Final Answer:
The probability that more than 7 patients will have this mild side effect $=0.0271 $

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