Question
Historical data show that customers who download music from a popular Web service spend approximately $24 per month, with a standard deviation of $4. Assume
Historical data show that customers who download music from a popular Web service spend approximately
$24
per month, with a standard deviation of
$4.
Assume the spending follows the normal probability distribution. Find the probability that a customer will spend at least
$21
per month. How much (or more) do the top 10%
of customers spend?
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Sample Size Determination In Clinical Trials With Multiple Endpoints
Authors: Takashi Sozu, Tomoyuki Sugimoto, Toshimitsu Hamasaki, Scott R Evans
1st Edition
3319220055, 9783319220055
