Discrete Probability, Valid Claim, statistics homework help

Hi Class,

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

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