Answer:
The sales tax is 2.8 and the total cost is 72.8.
Step-by-step explanation:
4% = 0.04
70.00 × 0.04 = 2.8
70 + 2.8 = 72.8
Answer:
A batch of 20 semiconductor chips is inspected by choosing a sample of 3 chips. Assume 10 of the chips do not conform to customer requirements.
a) Number of different samples = 20C3 =
=1140
b) 2 good and one bad chip
Number of samples = 10C2 * 10C1 = 45 * 10 =450
c) 2 good 1 bad + 1 good 2 bad + 3 bad
Number of samples = 10C2 * 10C1 + 10C1 * 10C2 + 10C3
= 
The answer to your question is 40.
The probabillity can be found by using binomial probability formular considering that the event is discrete in nature and there are two possiple outcomes.