1388. The store employees found that on average 85% of vacuum cleaners do not require additional adjustment when selling. Find: a) the most probable number of vacuum cleaners that do not require additional adjustment in a batch of 110 vacuum cleaners; b) the probability that in a batch of 110 vacuum cleaners require an additional adjustment of not more than 10; c) the relative frequency, vacuum cleaners that do not require additional adjustment, in the batch of 110 vacuum cleaners deviate from the probability by no more than 0.02 (in absolute value).

Detailed solution. Decorated in Microsoft Word 2003 (Quest decided to use the formula editor)