In statistics a random variable is one that will take a value not known now with certainty. Which of these is not a random variable? A. The time the 06:15 train from Cambridge will actually arrive tomorrow. The time the 06:15 train from Cambridge actually B. C. D. arrived yesterday. Your score on the QTI course in the Summer. The winning postcode in the next Health Postcode lottery draw.

Q: How are your grades? In a recent semester at a local university, 400 students enrolled in both…

A: given data  n(total) = 400 n(A in statistics) = 90 n(A in psychology) = 68 n(A in both) = 31

Q: If one student is chosen at random from those who took the test, Find the probability that the…

A: It is given that the grades and gender of a group of students is given in the table.

Q: 60% of all students at a college still need to take another math class. If 4 students are randomly…

A: Givenp=0.60n=4x~Binomial(n=4,p=0.60)P(X=x)=(nx)×px×(1-p)n-x ; x=0,1...,n

Q: At a certain University, the chance of a student receiving financial aid is 73%. 15 students are…

A:

Q: Endangered Species The chart below shows the numbers of endangered and threatened species both in…

A: From the given data: Total=779 P( mammal)=347/779 P( foreign bird)=539/779 P( mammal and foreign…

Q: There are 10 questions on a multiple-choice quiz. Each question has four possible answers. Suppose…

A: The number of multiple-choice questions is 10. The number of possible outcomes is 4.

Q: In a batch of 2170 boxes of cereal, there are, on average, 12 with prizes. If a random sample of 170…

A: Given: Total number of boxes of cereal = 2170 On average prizes = 12 Probability of success p =…

Q: 73% of all students at a college still need to take another math class. If 4 students are randomly…

A: Since you have asked multiple questions, we will solve the first question for you. If you want any…

Q: Part a though c. Thank you!

A: a. The sample proportion p^​ is calculated as p^​=nx​×100, where x is the number of successes and n…

Q: Giving a test to a group of students, the grades and gender are summarized below B C A 9 17 18 Male…

A: Total students: T = 81

Q: K A tourist in Ireland wants to visit five different cities. If the route is randomly selected, what…

A: From the given information,Total cities = 5 Using formula

Q: In a large population, 57% of the people have been vaccinated. If 3 people are randomly selected,…

A: Obtain the probability that that at least one of them has been vaccinated. The probability that that…

Q: Sixty-five percent of men consider themselves knowledgeable football fans. If 14 men are randomly…

A: given p=65%=0.65 , n=14  P(X=3)=? X~Bin(n=14, p=,0.65)

Q: Zach ,a Quality Process Engineer for Hershey Chocolates, pulled 16 random kisses from duction and…

A: For the given information, sample mean=0.1608=AVERAGE(E1:E16) sample standard…

Q: A school newspaper reporter decides to randomly survey 12 students to see if they will attend Tet…

A: Solution: From the given information, probability that the students attend Tet festivities is 0.18…

Q: 30% of all college students major in STEM (Science, Technology, Engineering, and Math). Round your…

A: answer By using given data,

Q: A political candidate has asked you to conduct a poll to determine what percentage of people support…

A: Given,sample size(n)=470no.of who support the candidate(x)=370sample proportion(p^)=xn=370470

Q: The data in the table represent the number of consumer complaints against major U.S. airlines. If…

A: total complaints =285+252+294=831

Q: Exactly 2 of them need to take another math class.  b. At most 2 of them need to take another math…

A: Given that  n = 5 , p = 71% = 0.71 , q = 1 - p = 1 - 0.71 = 0.29 X ~ Binomial (n = 5 , p = 0.71) X:…

Q: At a used-book sale, 100 books are adult books and 155 are children's books. Of the adult books, 74…

A: The contingency table is given as : Adult booksChildren bookTotalNon…

Q: Part a through d please. Thank you!

A: To solve these problems, we can use the binomial probability formula. The binomial probability of…

Q: A charity organization hosts a raffle drawing at a fundraising event. The organization sells 2500…

A: Tickets sold by a charity organization at a price of $8 are 2500 each. Winning tickets are selected…

Q: About 61% of US adults want to reach their 100th birthday.  You randomly select 8 US adults.  The…

A: given data  P9reach their 100th birthday) = p = 0.61 sample size (n) = 8 x = no. of people reach…

Q: A test was given to a group of students. The grades and gender are summarized below A Total Male 7.…

A:

Q: If the chocolate is too heavy, Zachwill need to pay Hershey's distributor a small overage fee. Test…

A: Given Information:  alpha value = 0.01 u = 0.16 oz

Q: A group of 876 people were asked if statistics teachers know the true meaning of life. 431 responded…

A: Given dataTotal no people = 876No of people who thinks, statistics teachers know the true meaning of…

Q: 64% of all bald eagles survive their first year of life. If 49 bald eagles are randomly selected,…

A: The question is about discrete prob. distributionGiven :Prop. of all bald eagles survive their first…

Q: student is selected at random, find the probability that he or she owns a credit card given that the…

A: Given that  The responses are listed in the table. Class Credit card Cash Total…

Q: If one card is drawn from an ordinary deck of cards, find the probability of getting the following.…

A:

Q: Suppose that you randomly selected 26 adults. Assume 18% of the population smoke. Round all answers…

A: From the provided information, Sample size (n) = 26 18% of the population smoke that is p = 0.18 The…

Q: Suppose that a company gains an average of 5 customers per $500 spent on advertising. If the company…

A: Given that the company gains an average of 5 customers per $500 spent on advertising. That is, the…

Q: You flip a fair coin n times and calculate the relative frequency probability of heads as  number of…

A: here use basic of rule of large number

Q: a. Exactly 20 of them survive their first year of life. ? b. At most 19 of them survive their…

A: Given Data Probability of success,p = 0.64 Probability of failure,q=(1- 0.64 )= 0.36…

Q: 63% of all bald eagles survive their first year of life. If 50 bald eagles are randomly selected,…

A: Note:- "Since you have posted a question with multiple sub parts, we will provide the solution only…

Q: About 4% of children in the United States are allergic to peanuts. Choose three children at random…

A: For the defined events A as the child is allergic to peanuts, and NA as the child is not allergic to…

Q: Use the following table to find the probability that a randomly chosen member of the Student…

A: Here we’ve to find the probability that a randomly chosen member of the Student Government Board is…

Q: At a used-book sale, 102 books are adult books and 150 are children's books. Of the adult books, 76…

A: