12. How many micrograms are there in 5 milligram?
A. 0.005
B. 0.5
C. 500
D. 5000

13. What does the standard deviation of the mean represent? For values that arenormally distributed, it represents:
A. the value above and below the mean that includes 68 % of all data values
B. the difference between the highest data value and the lowest data value
C. the average of the difference between each data value and the mean value.
D. the spread of the normal distribution.

14. Given that a milligram 1 × 10 ⁻³ gram, what is a microgram?
A. 1 × 10 ³ gram
B. One thousand milligram
C. 1 × 10 ⁻⁶ gram
D. 0.001 gram

15. How many micrograms are there in one milligram?
A. 0.001
B. 0.1
C. 100
D. 1000

16. How many milligrams are there in one microgram?
A. 0.001
B. 1000
C. 0.1
D. 1,000,000