You flip 3 coins 20 times and record the number of heads. The results are listed below:

[tex]\[ 2, 1, 0, 2, 2, 0, 2, 2, 3, 2, 1, 2, 1, 2, 1, 1, 2, 1, 3, 1 \][/tex]

Complete the frequency table.

[tex]\[
\begin{tabular}{|c|c|}
\hline
Number of Heads & Frequency \\
\hline
0 & $a$ \\
\hline
1 & $b$ \\
\hline
2 & $c$ \\
\hline
3 & $d$ \\
\hline
\end{tabular}
\][/tex]



Answer :

Let's analyze the recorded outcomes and determine the frequency for each number of heads (0, 1, 2, and 3).

Given results:
[tex]\[ 2, 1, 0, 2, 2, 0, 2, 2, 3, 2, 1, 2, 1, 2, 1, 1, 2, 1, 3, 1 \][/tex]

To fill in the frequency table, we will count how often each number of heads appears in the list of results:

1. Count the number of times 0 heads appear:
- In the list: 0 appears twice.

2. Count the number of times 1 head appears:
- In the list: 1 appears seven times.

3. Count the number of times 2 heads appear:
- In the list: 2 appears nine times.

4. Count the number of times 3 heads appear:
- In the list: 3 appears twice.

We summarize these counts in the frequency table.

[tex]\[ \begin{tabular}{|c|c|} \hline \text{Number of Heads} & \text{Frequency} \\ \hline 0 & 2 \\ \hline 1 & 7 \\ \hline 2 & 9 \\ \hline 3 & 2 \\ \hline \end{tabular} \][/tex]

Thus:

- [tex]\( a = 2 \)[/tex]
- [tex]\( b = 7 \)[/tex]
- [tex]\( c = 9 \)[/tex]
- [tex]\( d = 2 \)[/tex]

This completes the frequency table with the calculated values.