Sigma Notation and Calculating the Arithmetic Mean · Exercise 9
A sample of 10 prices is chosen from a population of 100 similar items. The values obtained from the sample, and the values for the population, are given in and respectively.
(a) Is the mean of the sample within $1 of the population mean?
(b) What is the difference in the sample and population means?
\begin{array}{|c|}\hline \text{Prices of the sample} \\ \hline \text{$21} \\ \hline \text{$23} \\ \hline \text{$21} \\ \hline \text{$24} \\ \hline \text{$22} \\ \hline \text{$22} \\ \hline \text{$25} \\ \hline \text{$21} \\ \hline \text{$20} \\ \hline \text{$24} \\ \hline\end{array}
\begin{array}{|c|c|}\hline \text{Prices of the population} & \text{Frequency} \\ \hline \text{$20} & \text{20} \\ \hline \text{$21} & \text{35} \\ \hline \text{$22} & \text{15} \\ \hline \text{$23} & \text{10} \\ \hline \text{$24} & \text{18} \\ \hline \text{$25} & \text{2} \\ \hline\end{array}
OpenStax, Introductory Business Statistics 2e · §2.4 Sigma Notation and Calculating the Arithmetic Mean · Exercise 9
No hints for this one.
Check your full solution
Attach photos of your pages (up to 3) or one PDF — or check what you typed above. Lemma reads the work and verifies the reasoning, not just the answer.
Your first check today doesn't need an account.
Your photos and PDFs are read once and not stored — only the transcription is kept.