For that range, you can use the estimate of L/Ls = (M/Ms)^4, where Ls is the luminosity of the Sun and Ms is the mass of the Sun. 75% the luminosity gives 93% the mass.
Thanks @Janus, it surprised me how fast luminosity drops off with such a small decrease in mass. Can the life time of the star on the main sequence be figured from the mass being 93%?
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