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A number cube was rolled as part of an experiment. The results are in the table below. The fraction [tex]\frac{1}{x}[/tex] is the experimental probability of rolling a 3. What is [tex]x[/tex]?

\begin{tabular}{|c|c|c|c|c|c|c|}
\hline \multicolumn{7}{|c|}{ Experiment Results } \\
\hline Number & 1 & 2 & 3 & 4 & 5 & 6 \\
\hline Frequency & 4 & 6 & 5 & 7 & 3 & 5 \\
\hline
\end{tabular}

A. 2
B. 3
C. 5
D. 6


Sagot :

To determine the value of [tex]\( x \)[/tex] such that [tex]\(\frac{1}{x}\)[/tex] is the experimental probability of rolling a 3, we need to follow several steps:

1. Calculate the total number of rolls:
- Number of times a 1 was rolled: 4
- Number of times a 2 was rolled: 6
- Number of times a 3 was rolled: 5
- Number of times a 4 was rolled: 7
- Number of times a 5 was rolled: 3
- Number of times a 6 was rolled: 5

Summing these frequencies gives the total number of rolls:
[tex]\[ 4 + 6 + 5 + 7 + 3 + 5 = 30 \][/tex]

2. Calculate the frequency of rolling a 3:
The frequency of rolling a 3 is given directly in the table as 5.

3. Calculate the experimental probability of rolling a 3:
The probability, [tex]\( P(3) \)[/tex], is given by the frequency of 3 divided by the total number of rolls.
[tex]\[ P(3) = \frac{\text{frequency of 3}}{\text{total number of rolls}} = \frac{5}{30} = \frac{1}{6} \][/tex]

4. Determine [tex]\( x \)[/tex] such that [tex]\( \frac{1}{x} = P(3) \)[/tex]:
We know [tex]\( P(3) = \frac{1}{6} \)[/tex]. Therefore, we need [tex]\( x \)[/tex] such that:
[tex]\[ \frac{1}{x} = \frac{1}{6} \][/tex]
By comparing both sides, we see that:
[tex]\[ x = 6 \][/tex]

Thus, the answer is [tex]\( x = 6 \)[/tex].