Aconcrete mix is designed to withstand 3000 pounds per square inch (psi) of pressure. the following data represent the strength of nine randomly selected casts (in psi). compute the mean, median and mode strength of the concrete (in psi). 3950, 4080, 3300, 3100, 2930, 3840, 4080, 4030, 3810 compute the mean strength of the concrete. the mean strength of the concrete is nothing psi of pressure. (type an integer or decimal. round to the nearest tenth as needed.) compute the median strength of the concrete. the median strength of the concrete is nothing psi of pressure. (type an integer or decimal. round to the nearest tenth as needed.) compute the mode strength of the concrete. select the correct choice below and, if necessary, fill in the answer box to complete your choice. a. the mode of the strengths of the concrete is nothing psi of pressure. (type an integer or a decimal. round to one decimal place as needed.) b. the modes of the strengths of the concrete are nothing psi of pressure. (type integers or decimals. round to one decimal place as needed. use a comma to separate answers as needed.) c. the mode does not exist.