standard deviation of 1.0 grams. The weight of the packaging (box, user’s guide, bubble wrap, etc.)
has a mean of 456 grams and a standard deviation of 6 grams. Together, the distribution of the
weight of the smartwatch and its packaging would have the following mean and standard deviation:
A. Mean 518 grams; standard deviation 7.0 grams
B. Mean 518 grams; standard deviation 3.5 grams
C. Mean 518 grams; standard deviation 6.1 grams
D. Mean 394 grams; standard deviation 6.1 grams
E. Mean 394 grams; standard deviation 3.5 grams
Students in a small high school were asked to vote for a meal for a school event. The results of the
survey and the grades of the students are summarized below.
Are the events Student is a junior and Student chose pizza independent?
A. Yes, because the proportion of juniors who chose pizza is the same as the proportion of all
students who chose pizza.
B. Yes, because the proportion of students that preferred pizza who are juniors is different from
the proportion of all students who are juniors.
C. No, because the proportion of juniors who chose pizza is the same as the proportion of all
students who chose pizza.
D. No, because the proportion of students who are juniors that preferred pizza is different from the
proportion of all students who are juniors.
E. No, because the proportion of juniors who chose pizza is different from the proportions of other
grades who chose pizza.
The total cholesterol level in a large population of people is strongly skewed right with a mean of
210 mg/dL and a standard deviation of 15 mg/dL. If random samples of size 16 are repeatedly
drawn from this population, which of the following appropriately describes the sampling
distribution of these sample means?
A. The shape is unknown with a mean of 210 and a standard deviation of 15.
B. The shape is somewhat skewed right with a mean of 210 and a standard deviation of 3.75.
C. The shape is approximately normal with a mean of 210 and a standard deviation of 15.
D. The shape is approximately normal with a mean of 210 and a standard deviation of 3.75.
E. The shape is now skewed left with a mean of 210 and a standard deviation of 3.75.
- In one metropolitan region, technical writers have an annual salary that is approximately normally
distributed with a mean of $55,800. The first quartile of salaries is $48,815. What is the standard
deviation?