5. the dot - plot represents the number of bookmarks found on 12 browsers of different computers in the…

Explanation:

Step1: List out the data values

The data values from the dot - plot are: 90, 95, 95, 100, 100, 120, 120, 130, 130, 130, 140. There are (n = 11) data points.

Step2: Calculate the mean

The formula for the mean (\bar{x}=\frac{\sum_{i = 1}^{n}x_{i}}{n}). (\sum_{i=1}^{11}x_{i}=90 + 95+95 + 100+100+120+120+130+130+130+140=1250). (\bar{x}=\frac{1250}{11}\approx113.64).

Step3: Calculate the median

Since (n = 11) (an odd number), the median is the (\left(\frac{n + 1}{2}\right))-th value. (\frac{n+1}{2}=\frac{11 + 1}{2}=6)-th value when the data is arranged in ascending order. The 6 - th value in the ordered list 90, 95, 95, 100, 100, 120, 120, 130, 130, 130, 140 is 120.

Answer:

a. Mean: approximately (113.64) b. Median: 120