The answer is D, there is no bias as Josh used random sampling.
Answer: 8
Step-by-step explanation:
2x4
Do each prism seperately
(8x10x5)+(4x4x5)
(400)+(80)
480in^3
Answer: option d.
Step-by-step explanation:
You have the following formul given in the problem:

You know that:
The number of customers serviced in an hour by the technical support representative is 6 costumbers, therefore:

As the problem asked for the probability that a costumber will be on hold less than 30 minutes, we know that:

Substitute the values above into the formula.
Then, you obtain:
or 95%