You are ready to put your house on the market since you have just accepted a new job in another state. Looking to sell the house quickly, you are investigating various realtors in the local area. On their website, HOME Realty displays the following frequency distribution summarizing the selling time (in days) of the last detached, residential houses they sold. Setting time Frequecny
0 to 10 5
11 to 21 6
22 to 32 6
33 to 43 1
44 to 54 3

Required:
Based on the frequency distribution, using the midpoint of each data class, estimate the mean selling time of the houses.