3 Elsa is creating a new FB account, and doesn't know what to make herpassword. She decides to generate a 14-character password by selecting each characterindependently and uniformly at random from {a, b, . . . ,Characters can be repeated.z} U {A, B, ..., Z} U {0, 1, ..., 9}.(a) What is the probability that exactly 7 of the characters are digits?(b) What is the expected number of digits in the password?(c) What is the variance of the number of digits in the password?

Answered: Image /qna-images/answer/f29a3fea-ab55-4d77-aed7-ebf4550bba71.jpg

Answered: 3 Elsa is creating a new FB account,…

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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A package of seven lightsabers contains 3 defective sabers. If four sabers are selectedfor use in the following Jedi tournament, find the probability that at most 1 (one) ofthem are defective.
In roulette, a wheel is divided up into slots of equal area. each slot is labeled with one of the numbers from 0 through 36, and one slot is labeled with a 00. half the slots are red, and half the slots are black. when the wheel is spun, it lands on one of these slots.( the problem is complete.) (a) if the wheel is spun three times, find the probability it lands on a 17 twice, and then a red slot.(b) if the wheel is spun three times, find the probability it does not land on the 00 slot all 3 times.(c) if the wheel is spun three times, find the probability it lands on a slot other than 00 all three times.
In a certain Algebra 2 class of 27 students, 11 of them play basketball and 9 of them play baseball. There are 11 students who play neither sport. What is the probability that a student chosen randomly from the class plays both basketball and baseball?
Suppose there are exactly three states of weather: sunny, cloudy, or rainy. If it is sunny today, then the probability is 3/4 that it will be sunny tomorrow, 1/8 that it will be cloudy tomorrow, and 1/8 that it will be rainy. If it is cloudy today, then the probability is 1/2 that it will be sunny tomorrow, 1/4 that it will be cloudy tomorrow, and 1/4 that it will be rainy. If it is rainy today, then the probability is 1/4 that it will be sunny tomorrow, 1/2 that it will be cloudy tomorrow, and 1/4 that it will be rainy. cloudy is From this Markov model, for any given day the probability that it will be sunny is rainy is Round your answers to three decimal places. and
2. A group of three undergraduate and six graduate students are available to fill certain student government posts. If four students are randomly chosen from this group, find the probability that exactly two undergraduates will be among the four chosen. [Hint: How many ways are there to fill the posts? How many ways satisfy the condition of having exactly TWO undergraduates selected AND hav- ing exactly two graduates selected?]
A subcommittee is to be selected from a committee of men and women. For this problem, assume that there are 8 men and 5 women on the committee, and that a subcommittee of 3 is selected at random. What is the probability that all are male given that all are the same sex?
5. A group of n people stand in a line. On the count of three, each of them simultaneously chooses to look either left or right (with equal probability): at one of their neighbors. Let X be the number of pairs of adjacent people that end up facing each other. (For example, if n = 5 and the random facings are "Left, Left, Right, Left, Right" then only the 3rd and 4th people face each other.) (a) Find the expected value E[X]. (b) Find Pr[X=0]. (c) Assuming n is even, find the maximum possible value of X, and the probability that X is equal to that value.

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