Okay, here we need to calculate the summation of the data, lets do it:
[tex]\sum ^{}_{}x=58+85+14+59+79+92+61+50=498[/tex][tex]\sum ^{}_{}x^2=58^2+85^2+14^2+59^2+79^2+92^2+61^2+50^2=35192[/tex][tex](\sum ^{}_{}x)^2=(58+85+14+59+79+92+61+50)^2=(498)^2=248004[/tex]