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Chapter 12
Chapter 8
Question 1
Ogives
A cumulative frequency distribution of errors for a department is as follows:
Error value Cumulative frequency
$0 to less than $50 5
$50 to less than $100 8
$100 to less than $150 14
$150 to less than $200 18
$200 to less than $250 20
How many errors were there in total?
How many errors had a value of $100 or over?
How many errors had a value of $50 or over but less than $200?
As the figures are cumulative, 20 is the total number of errors.
Of the 20, 8 were of values less than $100, so 12 are for $100 or over.
Of the 20, 18 were of values less than $200 but of those 18, 5 were of values
less than $50, so only 13 fit the criteria.
202
