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Statistical Validity
An oil change shop advertised to change oil within 15 minutes. Based on the data collected on a typical day, what is the
probability that oil change will take 15 minutes or
less time?
Based on the data, do you think the business
claim is valid? Explain why or why not. Class
Interval Frequency 6 to 10 minutes 3 11 to 15
minutes 8 16 to 20 minutes 6 21 to 25 minutes 2
More than 25 Minutes 1 Chapter 5 Probability vs
Coincidence What are the
differences between probability and coincidence?
Can the probability be more than 1 or less than
0? Explain why or why not.

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