11th Grade ISASP - Statistics and Probability

Which of the following pieces of information would NOT be useful in deciding what type of car is the most economical to drive?

• Median income of drivers

• Range of insurance costs

• Average miles per gallon

• Typical cost of repairs per year

• Cost of routine maintenance

In the graph, each dot shows the number of sit-ups and the corresponding age for one of 13 people. According to this graph, what is the median number of sit-ups for these 13 people?

• 15

• 20

• 45

• 50

• 55

For which quantities below is it more reasonable to estimate the quantity by gathering data on a sample rather than on the whole population?

I. The percentage of cell phones in the United States that have a red phone case.

II. The percentage of high school basketball players in a certain state who are left-handed.

III. The percentage of gift cards from all retail stores with a remaining balance of less than $5.00

• Only I

• Only III

• Only I and III

• Only II and III

• I, II, III

The box-and-whisker plots summarize the weights, in thousands of pounds, of the last months' shipments by Company A and Company B.

Which of the following statements must be true about the weights?

• The range for Company A is less than the range for Company B

• The mean for Company A is equal to the mean for Company B.

• The mean for Company A is greater than the mean for Company B.

• The median for Company A is equal to the median for Company B.

• The median for Company A is greater than the median for Company B.

Greg starts his lawn mower by pulling a rope.

* Greg successfully starts the lawn mower 80% of the time on the first pull.

* If the first pull is not successful, Greg tries a second pull, which is successful 90% of the time.

What percentage of the time is Greg NOT successful on the first pull, but successful on the second pull?

• 2%

• 8%

• 10%

• 18%

• 72%

The following histograms represent the distribution of t. In which of the histogram can the distribution of t best be described by the mean and standard deviation?

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A certain company keeps a list of 50 employees and their annual salaries. When the salary of the very highly paid president is added to this list, which of the following statistics is most likely to be approximately the same or nearly the same for the original list and the new list?

• The highest salary

• The range

• The mean

• The median

• The standard deviation

The manager of food services at a local high school is interested in assessing student opinion about a new lunch menu in the school cafeteria. The manager is planning to conduct a sample survey of the student population.

• Randomly select one day of the week and then select the first 30 students who enter the cafeteria on that day.

• Post the survey on the school Web site and use the first 30 surveys that are submitted.

• Randomly select 30 students from a list of all the students in the school.

• Randomly select one classroom in the school and then select the first 30 students who enter that classroom.

• Randomly select 30 students from a list of all the juniors in the school.