Almost all programming assignments begins with reviewing the requirements and break down the problem into smaller pieces.
It is also necessary to identify if something is missing in the requirement and ask for additional information, otherwise you might start solving the wrong problem.
In your case this is one way to break down the problem:
1. Read data from a text file
Read up on file operations and find the best way to read the file.
1a. Split input data
If you decide to read the whole string, read up on how to split up a string in several parts.
1b. Insert data into an array
As mentioned in the comments, a dynamic list might be to prefer as you don't know how many values there will be in the file.
2. Calculating the required values
How to traverse an array and find the maximum value?
How to traverse an array and find values larger than the standard?
(In this case you will need another array)
Note: What is standard in this case?
3. Display the result
Well, this is probably the easiest part.
By doing this it is easy to identify how many functions you need and also the input and output from each function.
(Depending on your choice of implementation you can of course do step 1 and 2 at the same time, but for a beginner it might be better to separate the operations.)
You should also write a little implementation description for each function.
It is good enough to use the Input-Process-Output model for this.
Example
Function Name: ReadFileFromFile
Input: The name of the file to read
Process: Read the file and store the values in an array
Output: An array with the the read values as return value
From this you then create your function prototypes
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