7 Below is a boxplot of the seal strengths of 100 chips bags

7. Below is a boxplot of the seal strengths of 100 chips bags. (a) Approximately, what percentage of bags had seal strengths below 350? (b) Approximately, what percentage of bags had seal strengths between 250 and 325? (c) Circle the correct answer choice: The distribution of seal strengths is skewed to the left / symmetric about its mean / skewed to the right. (d) Identify the outlier by circling in on the boxplot and write down its approximate value. (e) Find the approximate range of this data set.

Solution

a. The right edge(350) of the box denotes 3rd quartile. So approx percentage below 350 = 75%

b. The left edge(250) is 1st quartile and line(325) inside the box is median. So between 250 and 325, percentage = 50 - 25 = 25%

c. Skewed to the left as median is towards right

d. Outlier is the circle at 50

e. Range = 375 - 150 = 225