Explore Westonci.ca, the premier Q&A site that helps you find precise answers to your questions, no matter the topic. Ask your questions and receive accurate answers from professionals with extensive experience in various fields on our platform. Get quick and reliable solutions to your questions from a community of experienced experts on our platform.

Find the mean for the data items in the given frequency distribution.

[tex]\[
\begin{tabular}{|l|l|l|l|l|l|l|l|l|}
\hline
Score, $x$ & 1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 \\
\hline
Frequency, $f$ & 3 & 3 & 6 & 6 & 6 & 2 & 6 & 3 \\
\hline
\end{tabular}
\][/tex]

The mean is [tex]$\square$[/tex]. (Round to 3 decimal places as needed.)


Sagot :

To find the mean of the given frequency distribution, we follow these steps:

1. List the Scores and Frequencies:
[tex]\[ \begin{array}{|c|c|c|c|c|c|c|c|c|} \hline \text{Score, } x & 1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 \\ \hline \text{Frequency, } f & 3 & 3 & 6 & 6 & 6 & 2 & 6 & 3 \\ \hline \end{array} \][/tex]

2. Calculate the Total Frequency:
To determine the total frequency, sum up all the frequencies:
[tex]\[ \text{Total Frequency} = 3 + 3 + 6 + 6 + 6 + 2 + 6 + 3 = 35 \][/tex]

3. Calculate the Weighted Sum of Scores:
Each score needs to be multiplied by its corresponding frequency, and then all these products should be summed:
[tex]\[ \text{Weighted Sum} = (1 \times 3) + (2 \times 3) + (3 \times 6) + (4 \times 6) + (5 \times 6) + (6 \times 2) + (7 \times 6) + (8 \times 3) \][/tex]
Calculating each individually:
[tex]\[ \begin{align*} 1 \times 3 & = 3 \\ 2 \times 3 & = 6 \\ 3 \times 6 & = 18 \\ 4 \times 6 & = 24 \\ 5 \times 6 & = 30 \\ 6 \times 2 & = 12 \\ 7 \times 6 & = 42 \\ 8 \times 3 & = 24 \\ \end{align*} \][/tex]
Summing these products:
[tex]\[ \text{Weighted Sum} = 3 + 6 + 18 + 24 + 30 + 12 + 42 + 24 = 159 \][/tex]

4. Calculate the Mean:
The mean ([tex]\(\bar{x}\)[/tex]) can be calculated by dividing the weighted sum by the total frequency:
[tex]\[ \bar{x} = \frac{\text{Weighted Sum}}{\text{Total Frequency}} = \frac{159}{35} \approx 4.543 \][/tex]

Therefore, the mean of the given frequency distribution is:
[tex]\[ \boxed{4.543} \][/tex]