Four different ways to withdrawal money out of a checking account?

What is the correlation coefficient between the variables? round to three decimal places. enter your answer in the box

What is the interquartile range of this data set? 2, 5, 9, 11, 18, 30, 42, 48, 55, 73, 81

Jonathan can type 20 documents in 40 minutes ,and susan can type it in 30 minutes and jack can type it in 24 minutes working together ,how much time will it is take them type the same document