### 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?