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Claire flips a coin 4 times. Using the table, what is the probability that the coin will show tails at least once?

\begin{tabular}{|c|c|c|c|c|c|}
\hline Number of Tails & 0 & 1 & 2 & 3 & 4 \\
\hline Probability & 0.06 & 0.25 & [tex]$?$[/tex] & 0.25 & 0.06 \\
\hline
\end{tabular}

A. 0.06
B. 0.25
C. 0.69
D. 0.94

Sagot :

To determine the probability that Claire's coin will show tails at least once when she flips it 4 times, we can follow these steps:

1. Understand the Problem:
- We are looking for the probability that there is at least one tails in 4 coin flips.

2. Use the Complement Rule:
- The complement rule in probability states that the probability of at least one tails is equal to 1 minus the probability of getting no tails at all.
- In simpler terms: [tex]\( P(\text{at least one tails}) = 1 - P(\text{no tails}) \)[/tex].

3. Identify the Given Probabilities:
- According to the provided table, the probability of flipping 0 tails (which means getting heads in all 4 flips) is 0.06.

4. Apply the Complement Rule:
- Using the complement rule, the probability of getting at least one tails is:
[tex]\[ P(\text{at least one tails}) = 1 - P(\text{no tails}) \][/tex]
- Substituting the given probability:
[tex]\[ P(\text{at least one tails}) = 1 - 0.06 \][/tex]

5. Calculate the Probability:
- Perform the subtraction:
[tex]\[ P(\text{at least one tails}) = 1 - 0.06 = 0.94 \][/tex]

Therefore, the probability that the coin will show tails at least once when Claire flips it 4 times is 0.94.