Question

The probability distribution of X, the number of imperfections per meter of a wallpaper, is given...

  1. The probability distribution of X, the number of imperfections per meter of a wallpaper, is given by:

x

0

1

2

3

4

5

f(x)

0.4

0.35

0.25

0.15

0.1

0.04

a)

Find the mean of the number of imperfections per meter of wallpaper.

b)

If you need 2 meters of the wallpaper to design a section of your bedroom, how many

imperfections do you expect to see in your wallpaper?

(2 mark)

c)

Find the standard deviation of the number of imperfections per meter.

Math   Statistics-And-Probability   
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