1. Assuming the the uncertainty of +/- 1 in the last digit , what is the relative uncertainty in ppt in the following numbers.

A. 6.02 10^23

B. 500

C. 40

D. 10.01

E. 9.99

2. A method for analysis of codeine in prescription drugs yielded the following results when applied to a codeine- free blank: 0.01, -0.2, 0.3, 0.2, 0.0, -0.1 mg codeine. Calculate the detection limit (in terms of miligrams in codeine) at 99% confidence level, based upon the mean.