![val926](/avatars/19301.jpg)
val926
05.06.2020 •
Mathematics
What are the answers to these questions
Solved
Show answers
More tips
- O Other What is the oldest joke ever told?...
- F Food and Cooking How to Make Lazy Cabbage Rolls? Simple Steps to a Delicious Dish...
- F Food and Cooking Unusually Delicious Shashlik - Follow the Etiquette of Proper Preparation!...
- L Leisure and Entertainment Couchsurfing: A New Way to Travel...
- G Goods and services Which TV is better - LCD or Plasma?...
- S Sport How to Learn to Pull Up on Monkey Bars?...
- L Leisure and Entertainment Scrapbooking: What is it and Why is it Becoming More Popular?...
- C Computers and Internet Where did torrents.ru move to?...
- B Business and Finance Understanding Cash Flow: What It Is and How It Works...
- C Computers and Internet What Are Peers and Seeds in Torrenting?...
Answers on questions: Mathematics
- M Mathematics 22 The total flying time for two flights is 15 hours. The flight time for the first flight is half of the second. How long is each light? 22. Let f be the flight time of the second...
- M Mathematics What is c in the equation 2x2-3x-4=5...
- M Mathematics A manufacturer has shipped 37 cameras to an electronics store, 2 of which are defective. If the electronics store sold 29 cameras before disc/ing that some were defective, what...
- M Mathematics Use the information below to find the height of the communications tower. round your answer to the nearest foot. ft....
- S SAT Aplant growing in a pot is more likely to be affected by a shortage of minerals than a plant growing in a garden. give the reason for thin...
- M Mathematics Please help, timed!! Will give Brainliest for correct answer, multiple choice!...
Ответ:
135°
Step-by-step explanation:
You want QRT. So if you look at it you have a straight line, which equals 180°. you already have an angle at 45° so all you do is 180-45 and that equals 135°
Ответ:
a) The probability that all the cordless phones are among the first fourteen to be serviced is 0.0295.
b) The probability that after servicing fourteen of these phones, phones of only two of the three types remain to be serviced is 0.0885.
c) The probability that two phones of each type are among the first six serviced is 0.1707.
Step-by-step explanation:
Twenty one telephones are arranged in order in which they will be serviced. Seven of these telephones are cellular, seven are cordless, and the other seven are corded phones.
Let p denotes the probability .
Out of 21, first fourteen phones to be serviced can be selected in 21 C 14 ways.
Out of those 14, seven cordless phones can be selected in 14 C 7 ways.
a) The probability that all the cordless phones are among the first fourteen to be serviced is given by:
p = (14 C 7 )*(21 C 14 )![=0.0295](/tpl/images/0506/1379/553f8.png)
b) Let the probability that after servicing fourteen of these phones, phones of only two of the three types remain to be serviced be denoted by s and is same as choosing one of three types of phones to be serviced as two phones will be remaining for the service.
Out of three type one type is selected in { }^3{C-1} ways and the probability of choosing 14 phones of which one is of same type is p.
q= (3 C 1) * p = 3 * 0.0295 = 0.0885
The probability that after servicing fourteen of these phones, phones of only two of the three types remain to be serviced is 0.0885.
c) The probability that two phones of each type are among the first six serviced is given by:
p = ( 7 C 2) * ( 7 C 2) * (7 C 2) * (21 C 6)
= 0.1707
The probability that two phones of each type are among the first six serviced is 0.1707.