Answer:
The number of times CD drives may fail are 4 .
Step-by-step explanation:
Formula
As given
A company manufactures CD drives that have a 1.6% chance of experiencing disc-read errors.
If a CD drive is tested for 250 read operations .
Percentage = 1.6 %
Total value = 250
Put all the values in the formula
Part value = 4
Therefore the number of times CD drives may fail are 4 .
t = 45 - 5(11-7)
Hope that helps:)