Working with his cousin, sam can refinish a table in 4 hours. working alone, his cousin can complete the job in 6 hours. how long would it take sam to refinish the table working alone

The first-serve percentage of a tennis player in a match is normally distributed with a standard deviation of 4.3%. if a sample of 15 random matches of the player is taken, the mean first-serve percentage is found to be 26.4%. what is the margin of error of the sample mean? a. 0.086% b. 0.533% c. 1.11% d. 2.22%

Which of the following is the result of expanding

How many ordered pairs of positive integers satisfy xy=32?