HOME Realty claims that the mean selling time of a detached, residential house is 30 or fewer days after it is listed with the company. Not ready to believe HOME, you sample 19 customers who sold a detached, residential house through HOME and record the selling times (in days) of the houses. Your data are summarized in the following histogram. Frequency 4 3 2. 0. 0 10 6 6 20 3 1 30 40 50 Selling time (in days) Based on the histogram, estimate the mean selling time (in days) for the sample of houses. Carry your intermediate computations to at least four decimal places, and round your answer to at least one decimal place.