A precise table or diagram is necessary. Formulate a perfect solution urgently.

DO$05$

$(05)($X$-$bar$)$: $15\mathrm{.}36,14\mathrm{.}61,16\mathrm{.}36,20\mathrm{.}2815\mathrm{.}7710\mathrm{.}79\mathrm{.}8\mathrm{.}37,4\mathrm{.}81,8\mathrm{.}173\mathrm{.}31$ X$-$bar $21\mathrm{.}65$ O a $2$ Ob $$ OC $45.3$