can someone explain how to come up with leaf portion in his question ?

Make a stem-and-leaf display of the data for the average length of stay in days. (Use the digit(s) to the left of the decimal point as the stem and the digit to the right as the leaf.)

7

5.7

5.5

7

6

6.8

7.4

6.8

7.5

7

7.2

9.4

7.1

7.3

6.6

8.4

7.8

6.9

6.7

7.2

6.8

7

7.3

8.7

7.2

7.4

10

9.6

6.4

7

7.6

5.5

9.9

7.3

11.1

6.6

6.7

5.3

7.5

6.9

7.1

10.3

6.8

6.2

5.2

7.6

7

5.6

7.1

7.3

8.5