Average Shortest Length of Tenure for Employee

[win_anthony]

The goal is to create an expression that will calculate the average length of service per employee < 1yr of service. Below is a sample table and the syntax that I tried but is not working. 

Any thoughts? 

Syntax that is not working > =Sum({<[Length of Service]={'<=1'} >}[Length of Service])/Count(DISTINCT Emp_ID)

Emp_ID	Dept	Length of Tenure
1	Shipping	0.2
2	Packing	5
3	Cashier	0.7
4	Management	0.4

[Saravanan_Desingh · Accepted solution]

Sum({<[Length of Service]={"<=1"} >}[Length of Service])/Count(DISTINCT Emp_ID)

Single quote represent a String. Can you try double quote?