Delta, United, and American Alrlines announced purchases of planes on July $18(\frac{7}{18}),$ February $12(2/12),$ and October $7(10/7),$ respectively.

$\backslash$table$[[$Date$,\backslash$table$[[$Delta$],[$Market$],[$Retum$]],\backslash$table$[[$Company$],[$Return$]],$Date,$\backslash$table$[[$United$],[$Market$],[$Return$]],\backslash$table$[[$Company$],[$Return$]],$Date,$\backslash$table$[[$Americar$],[$Market$],[$Retum$]],\backslash$table$[[$Company$],[$Return$]]],[\frac{7}{12},-49,-77,\frac{2}{8},-\mathrm{.}98,-1\mathrm{.}36,\frac{10}{1},\mathrm{.}69,33],[\frac{7}{13},\mathrm{.}00,\mathrm{.}39,\frac{2}{9},-1\mathrm{.}08,-1\mathrm{.}36,\frac{10}{2},\mathrm{.}59,\mathrm{.}83],[\frac{7}{16},230,2\mathrm{.}58,\frac{2}{10},\mathrm{.}59,31,\frac{10}{3},1\mathrm{.}29,1\mathrm{.}29],[\frac{7}{17},-2\mathrm{.}30,-1\mathrm{.}98,\frac{2}{11},79,4\mathrm{.}73,10/6,\mathrm{.}29,-3\mathrm{.}97],[\frac{7}{18},-2\mathrm{.}28,1\mathrm{.}18,\frac{2}{12},-\mathrm{.}49,-\mathrm{.}12,\frac{10}{7},-2\mathrm{.}39,-39],[7/19,-\mathrm{.}92,-\mathrm{.}63,\frac{2}{15},1\mathrm{.}29,3\mathrm{.}90,\frac{10}{8},69,\mathrm{.}69],[\frac{7}{20},-98,-1\mathrm{.}13,\frac{2}{16},\mathrm{.}69,-69,\frac{10}{9},-\mathrm{.}49,-34],[\frac{7}{23},\mathrm{.}80,\mathrm{.}46,\frac{2}{17},-\mathrm{.}49,-\mathrm{.}27,\frac{10}{10},\mathrm{.}49,-\mathrm{.}31],[\frac{7}{24},\mathrm{.}29,\mathrm{.}01,\frac{2}{18},\mathrm{.}49,\mathrm{.}23,\frac{10}{13},\mathrm{.}00,-\mathrm{.}29]]$

Given the above information, calculate the cumulative abnormal return $($CAR$)$ for these stocks as a group. All of the stocks have a beta of $1$ and no other announcements are made. $($A negative answer should be Indicated by a minus sign. Leave no cells blank be certain to enter $"O"$ wherever required. Do not round intermediate calculations and round your answers to $2$ decimal places, e$.$g$.,32\mathrm{.}16.)$