5. What is the standard deviation used for?
A. as a measure of central tendency
B. as a measure of dispersion
C. as a measure of spread of data that are normally distributed
D. as a measure of the error of the mean value

6. A bathroom scales displays a mass reading of 68.4 kg. Which one of the followingcould NOT be the true mass of the person standing on the scales?
A. 68.40 kg
B. 68.44 kg
C. 68.47 kg

D. 68.37 kg

7. Which of the following g does NOT describe a milligram?
A. 1 × 10 ³ gram
B. 1 × 10 ⁻³ gram
C. one thousandth of a gram
D. 0.001 gram

8. Look at the figure of a thermometer. What is the temperature reading?
A. 15 °C
B. 15.4 °C
C. 17 °C
D. 20 °C