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An internet service provider (ISP) has randomly selected a sample of 223 observations concerning values of the response variable Churn and several predictor variables based on customer activity during the most recently billed month. Here Churn equals Yes if a customer churned-left the internet service provider for another ISP-and equals No otherwise. The predictor variable MinutesOn is the average daily minutes the customer spent online. EmailSent is the average daily number of emails the customer sent from the email address provided by the ISP. ServCalls is the number of times the customer called for service. Below is part of the classification tree they derived from the data collected in the study. Of the sampled customers who spent an average of at least 511 minutes online per day and sent an average of at least 7 emails per day from their ISP-provided email address, how many churned?
Sterilization
A method of killing or removing all forms of life, including microorganisms, from a surface, fluid, or medication.
Consumable Supply
Items that are intended to be used up and replaced in a short amount of time, such as food, medical supplies, or office materials.
Biological Agents
Microorganisms or biologically-derived substances used in healthcare or industry, potentially including bacteria, viruses, or biological toxins.
Standard Precautions
A set of infection control practices used in healthcare to prevent transmission of diseases that can be acquired by contact with blood, body fluids, non-intact skin, and mucous membranes.
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