A newly synthesized heavy metal, Novium (Nv\text{Nv}Nv), is analyzed using a mass spectrometer. The sample is found to consist of only two isotopes.
Table 1 shows the mass numbers and percentage abundances of these two isotopes:
| Isotope | Mass number | Percentage abundance (%) |
|---|---|---|
| 286Nv^{286}\text{Nv}286Nv | 286 | 24.3 |
| 289Nv^{289}\text{Nv}289Nv | 289 | 75.7 |
Calculate the relative atomic mass (ArA_rAr) of this sample of Novium.
Give your answer to 1 decimal place.