75. In an examination 30% students have failed in mathematics, 20% of thestudents have failed in chemistry and 10% have failed in both mathematics and chemistry.A student is selected at random. What is the probability that () the student has failed inmathematics if it is known that he has failed in chemistry.(i) What is the probability that the student has failed either in mathematics or chemistry?

Answered: 75. In an examination 30% students have…

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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fifty five percent of US households say they would feel secure if they had $50000 in savings. You randomly select 8 household and I asked them if they would feel secure if they had $50,000 in savings. find the probability that the number that say they would feel secure is (a) exactly five, (b) more than five, and (c) at most five
I have a pile of books I want to read. In the pile there are 8 books of fiction and 5 books of non-fiction. On my way out the door to the airport to visit family for winter break I will randomly stuff 4 of the books into my luggage. 2 What is the probability that I choose exactly 3 books of fiction? For the instructor, this was question 8. O X 0.0979 X 0.125 X 0.1958 O X 0.3585 O / 0.3916
K A bag of 32 tulip bulbs contains 14 red tulip bulbs, 8 yellow tulip bulbs, and 10 purple tulip bulbs. Suppose two tulip bulbs are randomly selected without replacement from the bag. (a) What is the probability that the two randomly selected tulip bulbs are both red? (b) What is the probability that the first bulb selected is red and the second yellow? (c) What is the probability that the first bulb selected is yellow and the second red? (d) What is the probability that one bulb is red and the other yellow? (a) The probability that both bulbs are red is (Round to three decimal places as needed.) Give me all part answer this is one question
8 A fair coin is flipped 6 times. What is the probability that the coin lands heads up more often than it lands tails up? For the instructor, this was question 7. X 0.167 X 0.234 / 0.344 X 0.500 X 0.656 X 0.667
In a classroom of 20 students, 70% of them have brown eyes. If a teacher picks two students at random to pass out supplies, what is the probability he chooses two students without brown eyes? 49 (1) 100 3 (3) 38 91 (2) 190 (4) 100
please answer all thanks !
An observer stands at an overpass of a highway and counts the cars that pass by. He stops counting when he sees a red car. If the probability of cars which are red is 0.20, what is the probability that 10 car will be observed? (A) 0.389 B) 0.6825 c) 0.0268 none of the choices
The number of customers calling a call centre is, on average, 3 in 30 minutes. What is the probability that at least 1 customer calls in 11 minutes? (3 d.p.)
: The probability that a mountain-bike rider travelling along a certain track will have a tyre burst is 0.05. Find the probability that among 17 riders: (a) exactly one has a burst tyre (b) at most three have a burst tyre (c) two or more have burst tyres.
A bag contains 8 red, 3 blue and 13 yellow discs. A disc is selected at random from the bag. What is the probability that the disc selected is: (i) red (ii) blue (iii) yellow (iv) not yellow?
Sixty four percent of U.S. adults drink coffee. In a random sample of 17 adults, what is the probability that the number of adults that drink coffee is: (a) Exactly 5 (b) More than 7 (c) Between 9 and 12
Q5: The staff at a small company includes: 4 secretaries, 20 technicians, 4 engineers, 2 executives, and 50 factory workers. If a person is selected at random, what is the probability that he or she is a factory worker? (A) 5/8 (В) 1/2 (C) 1/5 (D) None of the above Q6: The probability that a person owns a microwave oven is 0.70, that a person owns a CD player is 0.26, and that person owns both a microwave and a CD player is 0.16, then the probability that a person owns a microwave or a CD player is (A) 0.5 (B) 0.182 (C) 0.8 (D) None of the above

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