Which of the following is the mean of the numbers 5, 7, 8, 10, and 15?
Correct!
Wrong!
The mean is calculated by adding the numbers (5 + 7 + 8 + 10 + 15 = 45) and dividing by the number of values (45 ÷ 5 = 9).
In a class of 30 students, 18 are girls. What percentage of the class are girls?
Correct!
Wrong!
The percentage is calculated by (18 ÷ 30) × 100 = 60%.
What is the median of the following set of numbers: 3, 7, 8, 12, 15?
Correct!
Wrong!
The median is the middle value in an ordered list.
If the mode of a set of numbers is 4, which of the following sets could be the correct data set?
Correct!
Wrong!
The mode is the number that appears most frequently in a data set.
If 25% of a data set is 20, what is the total number in the data set?
Correct!
Wrong!
If 25% equals 20, then 100% equals 20 × 4 = 80.