Chapter 7.1, Problem 9E

(a)

Program Plan Intro

Program plan: -

• Import header file and use namespace for standard I/O.
• Define main function.
• Declare and initialize the array grades[] with elements.
• Calculate the size of the array.
• Use the loopto iterate over the array and calculate the total grades.
• Store the total grades into the variablel.
• Declare the array deviation[] to store the deviation and calculate the mean and store the mean in the variable mean .
• Use the loop for find the deviation and storing them in the array deviation[].
• Use another loop to display the deviations stored in the array deviation.

Program description: -

The main purpose of the program is to determine the deviations of grades stored in the array and storing them in another array then display those values.

(b)

Program Plan Intro

Program plan: -

• Import header file and use namespace for standard I/O.
• Define the main function.
• Declare and initialize the array grades[] with elements.
• Calculate the size of the array.
• The for-loop is used to iterate over the array and calculate the total grades.
• Store the total grades into the variablel.
• Declare the array deviation[] to store the deviation and calculate the mean and store the mean in the variable mean .
• Use the loop to find the deviation and store them in the array deviation[].
• Now, determine the variance inside a loop.
• Use another loop to display the deviations and variance.

Program description:

The main purpose of the program is to determine and display the variance by modifying the program developed in exercise 9a.