Problem: Data on the rate of mixing of sand and salt particles in an air-fluidized bed are given in Table. The number of particles in each spot sample was about 100. Assume overall number fraction of component A in the mix is 0.49 a) For each run, calculate the estimated standard deviation s and the theoretical standard deviation for complete mixing e . b) How close was the mixture to being completely mixed after 87 s?

Data on mixing of 35/48-mesh salt in sand in a 2-in. air-fluidized mixer 8