Expected number of Wolf-Rayet stars (blue) and supernovae (red) in a cluster as function of the number of stars. The red-shaded areas indicate the expectation range (one standard deviation around the mean) of stars sufficiently massive to experience a supernova for the broken power-law initial mass function with an upper mass-limit as provided by Eq. (2). The blue-shaded area gives the same statistics for the number of Wolf-Rayet stars. The dotted curves give the mean of the number of Wolf-Rayet stars (blue) and expected number of supernovae (red) for a mass-function with a fixed upper-limit of 120 M_⊙.