CHAPTER 6
One-Variable Data Analysis
The stemplot shows the 2012 median household income for all 50 U.S. states to the nearest thousand
dollars. Which statement below is NOT true about the distribution of median incomes?
(A) The majority of states had a median income of at least $50,000.
(B) The median of the median household incomes is less than the mean of the median household
incomes.
(C) The distribution is skewed toward the smaller values.
(D) The 20th percentile is a median income of about $44,000.
(E) Three states had a median household income of about $64,000.
- Eggs are sorted into sizes (peewee, small, medium, large, extra large, and jumbo) by their mass. In
Canada, eggs between 56 and 62 grams are classified as large. Hillside Farm produces eggs whose
masses are approximately normally distributed with a mean mass of 59 grams and a standard
deviation of 5 grams. The eggs from Blue Sky Farm are also approximately normally distributed, with
a mean of 59 grams. A larger proportion of eggs from Blue Sky Farm are classified as large than are
those from Hillside Farm. Which statement is true about the distributions of the masses of eggs from
the two farms?