A number times 4 and then added to 3 equals 15. Make an equation for this situation and solve for the number

The mean of a set of data is -3.82 and its standard deviation is 2.31. find the z score for a value of 3.99.

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%

41/17 as a decimal rounded to the nearest hundredth