Problemes guia

PG5a

a)

#a
1400*50+345

## [1] 70345

35+0.0005*10000

## [1] 40

b)

(a <-(35/0.0005+345)/(1/0.0005-1400))

## [1] 117.2417

1400*a+35

## [1] 164173.3

c)

(r2<-1400*0.0005)

## [1] 0.7

1-r2

## [1] 0.3

d)

(sxy <- 0.0005*100)

## [1] 0.05

(sy2 <- sxy/1400)

## [1] 3.571429e-05

PG5b

1a

#1ai
(x<-4.714*7-sum(c(1,2,4,6,8,9)))

## [1] 2.998

h<-c(1,2,x,4,6,8,9)
sum(h)

## [1] 32.998

(hm<-mean(h))

## [1] 4.714

#1aiii
(pm<-3.405+4.126*hm)

## [1] 22.85496

1b

h^2

## [1]  1.000000  4.000000  8.988004 16.000000 36.000000 64.000000 81.000000

sum(h^2)

## [1] 210.988

sum(h^2)/7

## [1] 30.14114

sum(h^2)/7-hm^2

## [1] 7.919347

sqrt(sum(h^2)/7-hm^2)

## [1] 2.814134

12.65*sqrt(6/7)

## [1] 11.71162

2

3.405+4.126*6.931

## [1] 32.00231