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Loyalty discount! If the total amount of your purchases from the seller more than:

$3 the discount is 1%
$6 the discount is 2%
$9 the discount is 3%
$12 the discount is 4%
$15 the discount is 5%
$18 the discount is 6%
$20 the discount is 7%
$30 the discount is 10%
$0.32
1387. Workers of the store found that on average 75% of vacuum cleaners do not require additional adjustment when selling. In a batch of 110 vacuum cleaners, find:
a) the most probable number of vacuum cleaners that do not require additional adjustment, and calculate the probability corresponding to this event;
b) the probability that additional adjustment will not require 80 to 95 vacuum cleaners.
Detailed solution. Decorated in Microsoft Word 2003 (Quest decided to use the formula editor)
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