an author kept a log of how many pages he wrote in the past 7 days. what is the median of the numbers?

Explanation:

Step1: Read data from graph

Let's assume the number of pages written each day (in order from Monday - Sunday) are values (x_1,x_2,\cdots,x_7). From the bar - graph, if we estimate the values: Monday: 60, Tuesday: 90, Wednesday: 40, Thursday: 70, Friday: 70, Saturday: 80, Sunday: 40.

Step2: Arrange data in ascending order

Arrange the data set ({40,40,60,70,70,80,90}).

Step3: Find the median

For a data set with (n = 7) (odd number of data points), the median is the (\left(\frac{n + 1}{2}\right))-th value. Here, (\frac{7+1}{2}=4)-th value. The 4 - th value in the ordered data set ({40,40,60,70,70,80,90}) is 70.

Answer:

70