This is a question in r programming. it is a $3$ part question. give whatever r code and analysis $($comments next to code lines$)$ is needed to answer all $3$ parts correctly. dont use overly complicated codes. this is a introductory class and he has taught simple codes$-$ basic statistical visualisations, loops, if statements, basic functions, data frames, matrixes and stuff like that.

there is a problem in the answer provided by previous expert. $1-$ why did they mention number of questions needed to pass if didnt use it later in the code. and after running the code and rounding the number it is $0.$ check the code and correct it or can send new code.