documentclass[12pt,a4paper]{article}
usepackage{pgf,tikz,tkz-euclide,pgfplots}
usepackage{listings,float,amsmath,amssymb,amsfonts,amsthm}
usetikzlibrary{calc,patterns,angles,quotes,patterns,arrows}
usetikzlibrary{decorations.pathmorphing,intersections,through,backgrounds,fit,arrows.meta}
usepackage[left=2cm,right=2cm,top=2cm,bottom=2cm]{geometry}
begin{document}
begin{tikzpicture}[scale=0.95]tiny
coordinate (O) at (0,0);
  draw [-latex,very thick] (-1,0)--(6,0)coordinate(X) node[right]{$x$};
    draw [-latex,very thick] (0,-1)--(0,5)coordinate(Y) node[left]{$y$};
   node at (O) [below left]{$O$};
   fill (1,1)coordinate (q1) circle (2pt)node[left]{$q_1$};
   fill (2,3)coordinate (q2) circle (2pt)node[left]{$q_2$};
   fill (3,4)coordinate (q3) circle (2pt)node[left]{$q_3$};
   fill (5,3.5)coordinate (qn) circle (2pt)node[left]{$q_n$};
   fill (4,1.25)coordinate (P) circle (2pt)node[above=1.5mm, right=1mm]{$P$};
   draw [shorten >=0.4cm,shorten <=0.4cm,dotted,thick] (q3) to [bend left=6](qn);
    foreach i in {1,2,3,n}{
   draw [-latex, shorten >= -0.7500cm](qi)--(P)node[midway,sloped,above]{$mathbf{D}_{i}$};}
end{tikzpicture}
end{document}