Hello, vipulchavda. I have more than 13 years of experience in algorithms and more than 6 years of experience in C++ programming. I have read your project description and attached file carefully. Your problem is quite easy for me and I could solve it really quickly and in high quality. I use Google C++ code style guide in my work and have passed C++ Level 3 exam on this site on 93%. I am interested in your project and would like to do it for you. Thank you in advance.
This can be done quickly Just write a for loop to read/scan the array then find the mean.
for part two same concept but divide the mean by 1.2 then reverse engineer from there.