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eks<-function(x,lambda) (lambda*exp((-1)*lambda*x))
eks(4,0.166)

## [1] 0.08545482

#Untuk P(X<=15)
cdfexp<-function(x, lambda = 0.166) {
  pdf<-function(t) {
    lambda * exp (-lambda * t)
  }
  hasil<-integrate(pdf, lower = 0, upper = x)
  return(hasil$value)
}
cdfexp(4,0.166)

## [1] 0.4852119

uniform<-function(x,a=0,b=1) {1/(b-a)}
uniform(6,a=2,b=10)

## [1] 0.125

dunif(6,min=2,max=10)

## [1] 0.125

norm<-function(x,miu,sigma) {1/(sigma*sqrt(2*pi))*exp(-1/2*((x-miu)/sigma)^2)}
norm(4,5,1)

## [1] 0.2419707

dnorm(4,mean=5,sd=1)

## [1] 0.2419707