8th Grade Data Analysis, Statistics and Probability Quiz

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Question 1: A student has 6 black marbles and 2 red marbles in his pocket. He selects one marble at random, looks at it and puts it back. Then he will select another marble at random. What is the probability that the student selects black marbles both times?

Question 2: In the previous question, the student selects the first marble, looks at it and puts it back in the pocket. What is the probability that the student selects black marbles both times if the student did not put the first marble back in the pocket?

Question 3: The Venn diagram below shows how many students of a class play basketball, hockey, football or any combination of these sports.

Based on the Venn diagram, what is the number of students that play basketball?

Question 4: The number of points scored by a basketball team during a six game tournament are 89, 92, 101, 73, 83 and 89. What is the range of the number of points scored in these six games?

Question 5:

The monthly electricity consumption of US households is shown in the graph above. Which of the following is closest to the average household electricity consumption for the years 2006 to 2010?

Question 6: The circle graph below shows the percent of computers sold by an electronics store in 2010. The number of brand A computers is 120. What is the total number of brand B computers sold by the store in 2010?

Question 7: The pie chart below shows the functions of all employees of a company and their numbers. What percentage of employees are engineers?

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