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A volleyball player's serving percentage is [tex]$75\%$[/tex]. Six of her serves are randomly selected. Using the table, what is the probability that at most 4 of them were successes?

\begin{tabular}{|l|c|c|c|c|c|c|c|}
\hline
\# of Serves & 0 & 1 & 2 & 3 & 4 & 5 & 6 \\
\hline
Probability & 0.0002 & 0.004 & 0.033 & 0.132 & 0.297 & 0.356 & [tex]$?$[/tex] \\
\hline
\end{tabular}

A. 0.297

B. 0.466

C. 0.534

D. 0.822


Sagot :

To determine the probability that at most 4 of the selected serves are successful, we need to sum the probabilities of 0, 1, 2, 3, and 4 successful serves, as given in the table.

Given probabilities for the number of successful serves are:
- 0 successes: [tex]\(0.0002\)[/tex]
- 1 success: [tex]\(0.004\)[/tex]
- 2 successes: [tex]\(0.033\)[/tex]
- 3 successes: [tex]\(0.132\)[/tex]
- 4 successes: [tex]\(0.297\)[/tex]

The probability that at most 4 serves are successful (i.e., [tex]\(P(X \leq 4)\)[/tex]) is calculated by summing these probabilities:

[tex]\[ P(X \leq 4) = P(0) + P(1) + P(2) + P(3) + P(4) \][/tex]
[tex]\[ P(X \leq 4) = 0.0002 + 0.004 + 0.033 + 0.132 + 0.297 \][/tex]

Adding these together:

[tex]\[ 0.0002 + 0.004 + 0.033 + 0.132 + 0.297 = 0.4662 \][/tex]

Therefore, the probability that at most 4 of the serves were successful is [tex]\(0.4662\)[/tex].

Looking at the provided multiple-choice options:
- [tex]\(0.297\)[/tex]
- [tex]\(0.466\)[/tex]
- [tex]\(0.534\)[/tex]
- [tex]\(0.822\)[/tex]

The closest option to our calculated probability [tex]\(0.4662\)[/tex] is [tex]\(0.466\)[/tex].

Thus, the correct answer is:
[tex]\[ \boxed{0.466} \][/tex]
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