edad=8+9+10+9+8+8+10+9+8+9
 edad
## [1] 88
edad2=c(8,9,10,9,8,8,10,9,8,9)
sum(edad2)
## [1] 88
examen2a=90.2+76.9+50.1+100+92.4+45.2+85.4+89.6+72.5+88.7
examen2a
## [1] 791
examen2a/10
## [1] 79.1
examen2b=c(90.2,76.9,50.1,100,92.4,45.2,85.4,89.6,72.5,88.7)
examen2b
##  [1]  90.2  76.9  50.1 100.0  92.4  45.2  85.4  89.6  72.5  88.7
mean(examen2b)
## [1] 79.1