The following sample data reflect electricity bills for ten households in San Diego in March. 
Compute the range, variance, and standard deviation for these sample data. Discuss which of these three measures you would prefer to use as a measure of variation.
Definitions:
Safe Senders
A feature in email programs that allows users to specify which email addresses or domains are trusted, preventing their messages from being marked as spam.
Domain Name
The unique address of a website on the Internet, which consists of a website name and a domain extension, used to identify and locate websites.
Email Account
A registered account with an email provider that allows users to send and receive electronic messages.
Email Message
A digital form of communication sent through electronic mail platforms, consisting of a subject line, sender, recipient(s), and body text.
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