Answer
293.95 amu
Work Step by Step
Atomic mass is calculated by finding the weighted average of the masses of each of the isotopes of the atom. 60% of the atoms are $^{293}$Nv, which have a mass of 293.15 amu, and 40% are $^{295}$Nv which have a mass of 295.15 amu, so (0.60$\times$293.15)+(0.40$\times$295.15) gives 293.95 amu.
