Respuesta :
You add all the numbers then divide by the amount of numbers. The answer is 246.3636
[tex]\boxed{\sf Mean=\dfrac{Sum\:of\:terms}{No\:of\:terms}}[/tex]
[tex]\\ \sf\longmapsto Mean=\dfrac{291+297+254+268+199+197+218+231+199+278+278}{11}[/tex]
[tex]\\ \sf\longmapsto Mean=\dfrac{2710}{11}[/tex]
[tex]\\ \sf\longmapsto Mean=246.3[/tex]
