The following table shows the masses, m grams, of 100 unsealed bags of plain potato crisps. a.
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The following table shows the masses, m grams, of 100 unsealed bags of plain potato crisps.
a. Show that the heights of the columns in a histogram illustrating these data must be in the ratio 2 : 3 : 4.
b. Calculate estimates of the mean and of the standard deviation of the masses.
c. Before each bag is sealed, 0.05 grams of salt is added. Find the variance of the masses of the sealed bags of salted potato crisps.
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Related Book For 
Cambridge International AS & A Level Mathematics Probability & Statistics 1 Coursebook
ISBN: 9781108407304
1st Edition
Authors: Dean Chalmers, Julian Gilbey
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