Data & Statistics Quiz #1

According to the chart, how many students were surveyed?

• Not given
• 7 students
• 17 students
• 20 students

What statement is true about this data?
5, 15, 10, 15, 10, 10, 20, 20, 15

• The median is 10.
• The mode is equal to 12.5.
• Two modes exist: 10 and 15.
• The mean is larger than the median.

Rachel’s current math test scores are 83, 78, 96, and 99. She has two more tests to take.  If she has set a personal goal of earning a 90% overall, what two scores could she get to meet her goal?

• 87, 93
• 89, 91
• 90, 91
• 91, 93

The line plot below shows the hourly wages for each of the 11 employees at a job site.
What hourly wage would a 12^th employee have to make in order for the mean to be exactly $11.00?

• $9.00
• $10.00
• $11.00
• $12.00

The line plot shows the number of years that students played football at school.
Which measure of center best describes the data?

• mean
• median
• mode
• range

Shown is a graph of the frequency of the height of students. 
Which statement best describes the data displayed in the bar graph?

• Most of the students in the class have a height of 127 centimeters.
• Less than half the students have a height more than 124 centimeters.
• Half of the students have a height between 114 and 121 centimeters. 
• The frequency of students seems to be clustered around 127 centimeters.

The graph shows how many questions various percentages of students answered incorrectly on a recent 10-question quiz.
Which statement best describes the data displayed in the graph?

• Half of the class missed between 0 and 5 questions incorrectly.
• Most of the students incorrectly answered 20% of the questions.
• Less than 10% of the students missed all 10 questions on the quiz.
• The number of students decreases as the number of questions answered incorrectly increases.

To prepare for winter, several hardware stores around a large city order rock salt to sell in their stores.  The histogram represents the amount of those orders in pounds.
Which statement best describes the data presented in the graph?

• The orders cluster near 20 tons.
• The orders are symmetrical  at about 8 tons.
• Most stores seem to order 6 to 10 tons of salt. 
• There is a gap in the orders from 11 to 15 tons. 

Jimmy works at a greenhouse that grows sunflower plants. Which statement best describes the heights of the sunflower plants represented in the histogram?

• The heights cluster near 76 inches.
  
• The highest percentage of plants are in the 76-79 range.
• There is a gap in the height of plants from 72 to 75 inches. 
• The heights of the plants are symmetrical about 73.5 inches.

Mr. Young is growing plants in his greenhouse. The graph shows the heights of his plants. Which statement about measures of center relates best to the shape of the graph?

• The mean is higher than the mode.
• The mean is higher than the median. 
• The median is higher than the mean.
• The median is higher than the mode.