help with script please?

hello everyone, i am new to the fourms. i am attending a unix/linux class at a close by college. and my instructor has given us an assignment.
i understand it somewhat, but am confussed on o couple things. this is what he wants us to do.

1.) Prompt the user to enter a group of test scores.
2.) Calculate the lowest and highest scores as well as the overall average.
(this is where i am stuck)
3.) Print out (to the screen) the three items above and the total number of scores supplied by the user.
4.) Ask the user if (s)he has any more to process. If so, perform the above operations for the new batch of scores. If not, exit the script.

i am mainly stuck on number 2, i think i can figure out the rest on my own.

any help would be greatly appreciated.

thanks,
-Brycesk8er

Please read the Rules for Homework & Coursework Questions Forum and post your assignment on Homework & Coursework Questions

Enter a group of test scores :b:

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