one edge of the base of a square Pyramind is 6 cm long. The slant height of a triangular face is 5 cm and the height of the Pyramind is 4 cm. Find the total surface area of the Pyramind. Find also its volume .​

Quick! a survey of 57 customers was taken at a bookstore regarding the types of books purchased. the survey found that 33 customers purchased mysteries, 25 purchased science fiction, 18 purchased romance novels, 12 purchased mysteries and science fiction, 9 purchased mysteries and romance novels, 6 purchased science fiction and romance novels, and 2 purchased all three types of books. a) how many of the customers surveyed purchased only mysteries? b) how many purchased mysteries and science fiction, but not romance novels? c) how many purchased mysteries or science fiction? d) how many purchased mysteries or science fiction, but not romance novels? e) how many purchased exactly two types of books?

Answer! if you don’t mind, can you explain

What is the mean of the data set 125, 141, 213, 155, 281