1 . If the probability that a flight will be delayed is 0.21, then the probabili

Question

1 . If the probability that a flight will be delayed is 0.21, then the probability that it will not be delayed must be?

A.1.21

B. 0.89

C. 0.21

D. 0.79

___________

2. You select a name at random from a hat that contains 33 freshmen, 34 sophomores, 30 juniors, and 28 seniors. What is the probability that the name is a senior’s? (Round to three decimal places)

___________

3. The table below shows the class of ticket and whether a person survived the Titanic:

If a passenger is randomly chosen what is the probability they were a first or second class ticket holder? (Round your answer to four decimal places)

_______

4. The spinner below is used in a board game. If you spin the spinner once, what is the probability that it will land on a multiple of 3 or an even number?

0.6667

0.5000

0.8333

0.2500

_______

5. Two machines are selected at random from 10 for inspection. Suppose that unknown to the inspector, three of the ten machines are defective. Find the probability that both machines picked for inspection are defective?

0.6

0.067

0.522

0.1

0.6667

0.5000

0.8333

0.2500

Explanation / Answer

1. P(e)=1-0.21=0.79 i.e D

2.28/(33+34+30+28)=28/125=0.180

3. since table is not visible i am writing a general answer

P(e)={tickets in first+tickets in second}/total number of tickets

4. te={3,6,9,12,2,4,8,10}

P(e)=8/12=0.667 i.e A

5 P(defective0=0.3

P(both def)=3/10*2/9=0.067 i.e B

5.

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