Question

maura wrote down how many pages she read over the past 7 days. what is the mean of the numbers?

Explanation:

Step1: Find the sum of pages

From the bar - graph, the number of pages read on each day: Monday \(80\), Tuesday \(90\), Wednesday \(90\), Thursday \(30\), Friday \(30\), Saturday \(10\), Sunday \(90\).
Sum \(S=80 + 90+90 + 30+30 + 10+90\)
\(S=(80 + 10)+(90+90+90)+(30 + 30)\)
\(S = 90+270+60\)
\(S=420\)

Step2: Calculate the mean

The formula for the mean \(\bar{x}=\frac{\sum_{i = 1}^{n}x_{i}}{n}\), where \(n = 7\) (number of days) and \(\sum_{i=1}^{n}x_{i}=420\)
\(\bar{x}=\frac{420}{7}\)

Answer:

\(60\)