Write a C program that takes a shell argument and then calculates the incremental sum and mean till itself. For example, if the argument passed is 3, the incremental sum will be 6 (1+2+3) and mean would be 2(1+2+3/3).

The output of the program should be the incremental sum and mean.

The program should follow the below mentioned attributes

>>The incremental sum function should run in one child thread

>>The mean function should run in another child thread

>>The result of the sum and mean should be displayed in the parent thread.

In total there would be 3 threads, e.g., 2 child and 1 parent thread.