It appears there may be some confusion in your question regarding the average mass of a strand of hair and a grain of rice.
To clarify:
- A strand of hair has an average mass of 2.7 ounces.
- A grain of rice has an average mass of 0.02 ounces.
To find out how much heavier a strand of hair is compared to a grain of rice, you would subtract the mass of the grain of rice from the mass of the strand of hair:
\[ \text{Difference} = \text{Mass of Strand of Hair} - \text{Mass of Grain of Rice} \]
\[ \text{Difference} = 2.7 , \text{ounces} - 0.02 , \text{ounces} = 2.68 , \text{ounces} \]
Thus, a strand of hair is 2.68 ounces heavier than a grain of rice.