Statistics Test

Front

To find the average of a set of numbers, add up all the items and divide by...

Back

The number of items

Answer explanation

To find the average of a set of numbers, add up all the items and divide by the number of items. This is because the average is calculated by summing all values and dividing by the total count of values.

Front

Find the mode of the following numbers: 12, 10, 10, 10, 13, 12, 11, 13, 10

Back

10

Answer explanation

The mode is the number that appears most frequently. In this case, the number 10 appears 4 times, which is more frequent than any other number in the list.

Front

Average number of cavities Paisley's patients have: 1,0,1,5,6,3,4

Back

2.85

Answer explanation

To find the average number of cavities, add all values (1+0+1+5+6+3+4) and divide by the total number of values (7) to get 20/7 = 2.85. Therefore, the correct answer is 2.85.

Front

Nicole bowled 7 games last weekend. Her scores are: 155, 165, 138, 172, 127, 193, 142. What is the range of Nicole's scores?

Back

66

Answer explanation

To find the range, subtract the lowest score (127) from the highest score (193): 193 - 127 = 66. Therefore, the range of Nicole's scores is 66.

Front

What is the mode?

Back

Number happening the most

Answer explanation

Number happening the most

Front

Anh is investigating the heights of a group of students: 158cm, 172cm, 164cm, 164cm, 167cm, 159cm. What is the range of the heights?

Back

14cm

Answer explanation

The range of heights is calculated by finding the difference between the highest and lowest values. In this case, the range is 172cm - 158cm = 14cm, so the correct answer is 14cm.

Front

Difference between the medians for the two data sets?

Back

2 tickets

Answer explanation

The difference between the medians for the two data sets is 2 tickets, which is the correct answer choice.

Front

Find the medians for Science and Math.

Back

Science: 3 h; Math: 4.5 h

Answer explanation

The correct medians are science: 3 h; math: 4.5 h, as the median is the middle value when the data is arranged in ascending order.

Front

What is the range in gas mileage for cars?

Back

6

Answer explanation

The range in gas mileage for cars can vary, but the correct answer is 6 as it represents the highest range among the given choices.

Front

The dot plots show the ages of students at two different arcades. Which statement is best supported by the information in the dot plots?

• The range of the age of students at Arcade A is greater than the range of age of students at Arcade B.
• The distribution of the data for Arcade A and Arcade B are approximately symmetrical.
• The median age of students at Arcade A is greater than the median age of students at Arcade B.
• The maximum age at Arcade B is less than the maximum age at Arcade A.

Back

The median age of students at Arcade A is greater than the median age of students at Arcade B.

Answer explanation

The median age of students at Arcade A is greater than the median age of students at Arcade B.