MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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A brand of water-softener salt comes in bags marked “net weight 18kg”. The
company that packages the salt claims that the bags contain an average of 18kg of
salt and that the standard deviation of the weight of the bag is 0.68kg. Assume that
the weight of the bags is normally distributed and unless otherwise indicated use ? =
.05.  

P = 0.012

z =  = -2.33

μ=18

0.68

n = 10

Question

Consider the scenario where we randomly selected 10 bags of water
softener salt. If we were now interested in bags weighing both above and below
that claimed by the company.

a) Would you consider this evidence against the company’s claim?

b) In general, what mean weights of 10 randomly select bags would you
consider evidence against the company’s claim? 

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