Program to calculate the average of a set of grades and count the number of failing test grades •Name your program lab4.c •Start by asking the user how many grades are to be entered.•Then ask for each one of theses grades. Calculate the average grade and the number of failing grades (grade less than 70)Display on the screen the average grade and the number of failing grades

Steel balls 12 mm in diameter are annealed by heating to 1150 k and then slowly cooled to 400 k in an air att 325 k and h -20 w/m2 k. assume the properties of the steel to be k- 40 w/m k,p 7800 kg/m3, and cp 600 j/kg k. a. determine whether lumped system method can be used to analyze this problem and if so why" b. determine the time required for the cooling process. c. determine the total amount of heat lost from each ball to the ambient air