Need some help

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf
Of azzza
Sent: Sunday, October 14, 2007 10:21 PM
To: r-help at r-project.org
Subject: [R] Need some help


Hi!
I'm taking a course that requires some programming background, but I'm a
complete novice in the field.

when asked to generate a list of 20 uniform random numbers, is it alright if
I put in >randu, and just copy-paste the first 20 numbers?? Or is there, as
I suspect, a better way of calling out exactly 20 uniform random numbers??

I'm also unable to solve the following problem:
We know that on average 30% of the customers who enter a store make a
purchase. Suppose 200
people enter the store today. Run a simulation to see how many purchases we
will have today.

number_of_purchases <- sum(sample(c(0,1), 200, prob=c(.70, .30), replace=TRUE))