M$_{\odot}$ yr$^{-1}$. Probing the internal scatter for the first time at $z\!\gtrsim$1, we show trends of $U$-$V$ color with the relative ages of the stellar populations and the composite rest-frame spectral energy distributions (SEDs) of all quiescent galaxies. We show that the results would be similar if we used the $UVJ$ color selection of @Williams09. Finally, we place constraints on the star formation histories for passive evolution given the observed intrinsic scatter as a function of redshift.

We assume a $\Lambda$CDM cosmology with $\Omega_{M}$=0.3, $\Omega_{\Lambda}$=0.7, and $H_{0}$=70 km s$^{-1}$ Mpc$^{-1}$ throughout the paper. All magnitudes are given in the AB system.

Data
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The NEWFIRM Medium-Band Survey (NMBS) employs a new technique of using medium-bandwidth near-IR filters to sample the Balmer/4000Å break from $1.5<z<3.5$ at a higher resolution than the standard broadband near-IR filters [@vanDokkum09a], thereby improving the accuracy of the photometric redshifts. We briefly summarize the survey here, the full details of the reduction, source detection, and generation of the photometric catalogs will be described in K.E. Whitaker et al. (*in prep*). The NMBS survey is based on a similar concept to the optical medium-band filters used in the COMBO-17 survey [@Wolf03]. A custom set of five medium bandwidth 