HOME Realty claims that it can sell a detached, residential house faster than any other realty company. With the aim of examining HOME's claim, you sample 20 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 8. 7 6- 5 4 4- 3 2- 10 20 30 40 50 Selling time (in days) Based on the histogram, find the proportion of selling times in the sample that are less than 40 days. Write your answer as a decimal, and do not round your answer.