Mathematics 8 - 1st Quarter Exam

Which of the following best describes the mean of a data set?

• The number that occurs most frequently in data

• The middle value when data is arranged in order

• The difference between the highest and lowest values

• The total of all values divided by the number of items

A data set includes the values: 8, 10, 12, 14, and 50. What makes the mean less reliable as a measure of central tendency in this case?

• The data set is too small

• The values are all even numbers

• The value 50 is an outlier that skews the mean

• The mean is always reliable regardless of data

Anna recorded the number of books her classmates read last month: 3, 5, 5, 6, 7, 5, 8, 6. What is the mode of the data?

• 5

• 6

• 7

• 8

The math teacher recorded the quiz scores of students: 15, 17, 14, 20, 20, 18, 16, 15. What is the median of the data?

• 16.5

• 17

• 17.5

• 18

The test scores of 5 students in Math are: 78, 80, 82, 85, and 90. What is the mean score of the students?

• 82

• 83

• 85

• 84

Based on the mean in item #5, what can be concluded about the overall performance of the class?

• The class performed poorly

• Most students failed the test

• The class generally performed well

• The scores were inconsistent

Which of the following best defines an algebraic expression?

• A number sentence that contains an equal sign

• A sequence of steps used to solve a word problem

• A group of terms and symbols without an equal sign

• A number sentence showing equality of two expressions

Mila earns ₱250 for each weekday she works and ₱100 for each weekend day she works. If she works 5 weekdays and both weekend days in a week, which algebraic expression represents her total weekly earnings?

• 250×7

• 250+100×2

• 250x+100y, where x = 5 and y = 2

• 250x+100y, where x = 2 and y = 5

Which of the following is a monomial?

• 7xy

• x2−5

• 4x+3

• x+y+Z

Why can you add 3x and 5x directly?

• They are like terms

• They are both odd numbers

• They are constants

• They are both monomials