12-1: TEKS Practice

  • 1. Find the mean of the data set 10, 0, 2, and 8.

  • 2. A student received grades of 86, 88, 97, 82, and 60 on math quizzes. Find the mean.

  • 3. Find the mean of the following set of numbers.

    193, 153, 103, 120, 173

  • 4. Find the mean of the following set of numbers.

    109, 399, 422, 570

  • 5. Find the value of x such that the data set 102, 119, 106, 114, 108, and x has a mean of 119.

  • 6. Three cars are driving on a racetrack. The mean speed of the three cars is 100 miles per hour. Car X drives 103 miles per hour and Car Y drives 116 miles per hour.

    • a. Use the mean to estimate the speed of Car Z.

      • A. The speed of Car Z is about 100 miles per hour.

      • B. The speed of Car Z is greater than 100 miles per hour.

      • C. The speed of Car Z is less then 100 miles per hour.

      • D. It is impossible to estimate the speed of Car Z.

    • b. Find the actual speed of Car Z.

  • 7. The last five playgrounds built in town were constructed for the costs shown below. Find the mean cost. If a new playground is built for $1,500, how would that affect the mean?

    $1,780; $1,790; $1,560; $1,600

  • 8. Find the value of x such that the data set has a mean of 104.

    99, 123, 104, 111, 106, x

  • 9. Several people worked together to pick watermelons. A group of 4 people picked 27 watermelons. Another group, of 6 people, picked 53 watermelons. If all of the watermelons were shared equally, how many watermelons did each person get?

  • 10. Writing The last five houses built in town sold for the prices $189,000; $167,000; $170,000; $146,000; and $167,000.

    • a. What is the mean price of the houses?

    • b. If a new house built in town sold for $130,000, how would that affect the mean?

  • 11. Challenge The costs of four different cell phones are shown in the table. What is the mean cost of the four cell phones? If a fifth cell phone costs $192, what is the mean cost of all five cell phones?

  • 12. Error Analysis The mean of the data set 100, 121, 107, 114, 110, and x is 114. Your friend says that the value of x is 110.4.

    • a. What is the correct value of x?

    • b. What mistake might your friend have made?

      • A. Your friend found the median of the numbers, not the mean.

      • B. Your friend found the mean of the five numbers listed.

      • C. Your friend did not divide the sum of the values.

      • D. Your friend divided the sum of 6 numbers by 5, not 6.


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Table of Contents

Digits, Grade 8, Volume 2, Homework Helper Unit D: Two-Dimensional Shapes Unit E: Measurement and Data Unit F: Personal Financial Literacy Unit G: Step-Up Lessons English/Spanish Glossary Formulas Math Symbols Formulas Measures Properties