Answer:
void calculatеAvеragе(double array1[],int count);//function declaration
Explanation:
Here we are declared a function calculatеAvеragе() of void return type because there is no return type is mention in the question so I take void return type. The calculatеAvеragе() function takes two parameters one is an array of type double and other is a variable count of int types.
To declared any function we used following syntax
return_type functionname(parameter 1,parameter 2 .....parameter n)
So void calculatеAvеragе(double array1[],int count);