R help - Mar 2009 - Constructing a barplot in R

Hi all,

3.  The probabilities are 0.06, 0.21, 0.24, 0.18, 0.14, 0.10, 0.04, 0.02 and
0.01 that an airline will
receive 0,1,2,3,4,5,6,7 or 8 complaints per day about its luggage.Find

e(x) and e(x^2)

Give the R commands you use and the two numerical values.

Use the sample function to simulate complaints over 500 days. Give
the R command you use and draw a barplot of the simulated data. Comment on
how the pattern
you see relates to the probabilities in the question above.

I think i have done the first part and got e(x) = 2.75 and e(x^2)= 10.59

I have no idea how to simulate complaints over 500 days and draw a barplot.

can anyone help?

Thank you in advance
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On 6/03/2009, at 12:03 PM, SIrEllwood wrote:
>
> Hi all,
>
> 3.  The probabilities are 0.06, 0.21, 0.24, 0.18, 0.14, 0.10, 0.04,  
> 0.02 and
> 0.01 that an airline will
> receive 0,1,2,3,4,5,6,7 or 8 complaints per day about its luggage.Find
>
> e(x) and e(x^2)
>
> Give the R commands you use and the two numerical values.
>
> Use the sample function to simulate complaints over 500 days. Give
> the R command you use and draw a barplot of the simulated data.  
> Comment on
> how the pattern
> you see relates to the probabilities in the question above.
>
> I think i have done the first part and got e(x) = 2.75 and e(x^2)=  
> 10.59
>
> I have no idea how to simulate complaints over 500 days and draw a  
> barplot.
>
> can anyone help?
 From the Posting Guide:

Basic statistics and classroom homework:  R-help is not intended for  
these.

	cheers,

		Rolf Turner

P. S.  Your homework question says ``Use the sample function''  So  
read up
on the sample function:

	?sample

You will also find ?barplot useful.
		R. T.

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