Answer
$$3.38 \times 10^{-3}$$
Work Step by Step
1. Round off to three significant figures:
- Remove the last digit (8). And since $8 \gt 5$, add 1 to the next digit (7):
$$0.00338$$
2. Express in scientific notation.
- Put a decimal point right after the first different than 0 (3), and count the number of zeros on its left, which is equal to 3. Therefore, the number will be multiplied by $10^{-3}$.
$$3.38 \times 10^{-3}$$
