math

posted by .

i would like any help or suggestions you have please as i am very stcuk on these questions thanks

here is the scene:
each phone call made to the emergency services has probability 0.02 that it is not legitimate. assume that the legitimacy of one call is independant of weather or not other calls are legitimate.
here are the questions:
choose the option that is closet to:
A) the probability that the first call which isnt legitamate occurs on the 20th call
b) the probability that they receive at least 100 calls before they receive one which isnt legitamate
c)the probability that in a 150 calls, at least one is not legitamate

0.003 0.014 0.048 0.133 0.668 0.681 0.867 0.952

any ideas would be great hanks

A) 19 legitimate calls followed by a on legitimate one. Probability is:

0.98^19 * 0.02

B) 100 legitimate calls, after which it doesn't matter what happens. Probability is:

0.98^100

C)

Probability that all 150 are legitimate is 0.98^150, so the probablity that one or more are not legitimate is:

1 - 0.98^150

the response i got here i don't understand. what does the ^ stand for?
i have tried the way that you have said but i don't get any answers which match the ones i can choose from please please help thak you very mcuh

Similar Questions

1. math

100 people set up a phone call system so that the initial contact person call three persons, each of whom calla three persons,and so on until all have been contacted. The maximum people who do not need to make calls is?
2. phone charges project

Okay I need to know something about cell phones and land lines. My parents can't answer this because we don't have a land line anymore. We just have cells phones. Okay my question is if someone with a cell phone calls a land line person …
3. math

please help cuz i been trying for ages and cant get the answer each telephone call made to the emergency services either is or is not legitimate. suppose that each call received has probability 0.02 that it is not legitimate. assume …
4. English

Can you check the grammar in the following sentences, please?
5. english

hi everyone someone can say me if my dialogue it's good and say me also about the fault:)thnaks This scene takes place at Brian's parents home. Banks informs his wife about the call he has just had with their son "Sandra you can come …

7. math

Is it possible to set up a time to do a live chat with a tutor here?
8. Probability

Suppose that you move to a new house and you are 10% sure that your new house's phone number is 561290. To verify this, you use the house's phone to dial 561290, obtain a busy signal, and conclude that this is indeed your phone number. …
9. English

1. He called me later. 2. He rang me back. 3. He gave me a ring back. 4. He telephoned me back. 5. He made a phone call to me back. 6. He gave a phone call to me back. 7. He made a call to me back. 8. He made a call for me back. ================ …
10. English

Thank you for your help. The following questions are related to the verb 'call' one more time. 1. Did you call?

More Similar Questions