aianjie

 

AIM 2: Define the probability of event.

1、The following table summarizes the availability of trucks with air bags and bucket seats at a dealership.

	Bucket seats	No Bucket Seats	Total
Air Bags	75	50	125
No Air Bags	35	60	95
Total	110	110	220

What is the probability of randomly selecting a truck with air bags and bucket seats?

A) 0.34.

B) 0.16.

C) 0.28.

D) 0.57.

aianjie

 

The correct answer is A

75 / 220 = 0.34.

aianjie

 

2、If two fair coins are flipped and two fair six-sided dice are rolled, all at the same time, what is the probability of ending up with two heads (on the coins) and two sixes (on the dice)?

A) 0.4167.

B) 0.0069.

C) 0.0039.

D) 0.8333.

aianjie

 

The correct answer is D

Conditional probability is the probability of one event happening given that another event has happened. An outcome is the numerical result associated with a random variable. The probability of picking a perfect widget is 20 / 100 = 0.20 or 20%.

aianjie

 

2、Let A and B be two mutually exclusive events with P(A) = 0.40 and P(B) = 0.20. Therefore:fficeffice" />

A) P(B|A) = 0.20.

B) P(A or B) = 0.52.

C) P(A and B) = 0.

D) P(A and B) = 0.08.

aianjie

 

The correct answer is C

If the two evens are mutually exclusive, the probability of both ocurring is zero.