The data below represent the means from 15 sample control charts for the amount of time in minutes it takes students to complete a quiz in a basic statistics course.The same quiz was given to 15 different sections of a basic statistics course.Five students were sampled from each class and each mean is shown below. 
What is the value of the lower control limit?
Definitions:
Personal Selling Process
A series of steps taken by sales representatives to sell a product, including prospecting, approaching, presenting, handling objections, closing, and follow-up.
Personal Selling Process
A direct marketing approach that involves face-to-face interaction between a salesperson and a potential customer aimed at making a sale and building customer relationships.
Business Reply Card
A pre-addressed and prepaid postcard or form included with a mailing, allowing the recipient to respond easily to the sender.
Stimulus-Response Selling
A sales technique based on the premise that specific stimuli can elicit predictable responses from customers, guiding them towards a purchase.
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