where N is the total number of grades and the x with the bar over it is the mean of the grades in the file. This method is required to read the grades.txt file. Do not modify the Lab5.java file at all!
You may work with one partner on this in lab.
The objective of this lab is to allow you to practice reading from files in Java.
Create a BlueJ project named inlab5 and copy Lab5.java, Statistics.java and grades.txt into it.
Each line of the grades.txt file contains the last name of a CS 221 student, followed by a comma, followed by one or more spaces, followed by the corresponding first name, followed by one or more spaces, followed by a randomly made-up corresponding average for the student.
Supply the proper code for the calculateMean() method in the Statistics.java file. The method should calculate and return the average grade in the file. This method is required to read the grades.txt file. Do not modify the Lab5.java file at all!
Supply the proper code for the calulateStandardDeviation(double mean) method
in the Statistics.java file. The method should calculate and
return the sample standard deviation of the grades. The sample
standard deviation, sN,
can be calculated using the following formula:
where N is the total number of grades and the x with the bar over
it is the mean of the grades in the file.
This method is required to read the grades.txt file.
Do not modify the Lab5.java file at all!
E-mail the modified Statistics.java class to your lab TA in one message. The subject of the message should be: CS221-xx inlab5 your-names. The xx is the number of your lab section.
Delete the inlab5 project that you created. Empty the recycle bin. Thank you.