4.The below table displays average length of stay by hospital department. First column to the left is the name of the department, middle column is the number of beds in the department, and the third column to the right is the mean length of stay in each department. Show your calculations.

Name of hospital department Number of beds Mean length of stay (days)

Intensive care unit 10 26

Surgery 20 12

OB/Gynaecology 40 4

Chindrens Unit 50 8

Calculate the mean length of stay for 'Intensive care unit' and 'Surgery' together