There are two independent multiplechoice quizzes where quiz 1 has eight
questions and quiz 2 has 15 questions. Each question in the first quiz has four
choices and each question in the second quiz has five choices. Suppose a student
answers the questions in the quizzes by pure guessing.
i. What is the probability that at most three questions must be answered to
obtain the first correct answer in quiz 1? Interpret its value.
ii. What is the probability that less than four correct answers in quiz 2?
iii. In order to get high score, Siti needs to obtain at least six correct answers in
quiz 1. Is Siti likely to get the high score in quiz 1?
iv. What is the probability that obtains five correct answers before eighth
questions in quiz 2? Interpret its value.
v. Based on your answer in (iv), would you consider this event likely to occur?
Explain your reason.
 👍
 👎
 👁
 ℹ️
 🚩
1 answer

for test1
prob correct = 1/4
prob wrong = 3/4
i)
could be
c or wc or wcc , (c for correct, w for wrong)
prof (of that)
= 1/4 + (3/4)(1/4) + (3/4)^2 (1/4
= 37/64
ii) less than 4 correct
> none correct + 1 correct + 2 correct + 3 correct
= C(8,0) (1/4)^0 (3/4)^8 + C(8,1)(1/4) (3/4)^7 + C(8,2)(1/4)^2 (3/4)^6 + C(8,3)(1/4)^3 (3/4)^5
= .88618
iii) , what she CAN'T have is 7 wrong or 8 wrong.
prob of that
= 1  C(8,7)(3/4)^7 (1/4 )  C(8,8) (3/4)^8
= .6329
Follow the same kind of reasoning steps for the rest 👍
 👎
 ℹ️
 🚩
answered by Reiny
Answer this Question
Related Questions

Algebra
Which inequality represents the graph shown below ? 5___________0____________5 I don't understand it This is Solving MultiStep Inequalities Quiz Part 1
 asked by Frost
 12,497 views

Geometry (Due Today)
Can someone please help me with this quiz? 1. Identify a pair of alternate exterior angles. A) angle 3 and angle 4 B) angle 1 and angle 2 C) angle 1 and angle 6 D) angle 2 and angle 6 2. This diagram of airport runway intersections shows two parallel
 asked by Snazzy
 10,700 views

Spanish
Conexus Spanish Quiz, Lesson 5 Unit 5 In Spanish, how do you say "Computer Screen"? A. el reloj B. la mesa C. la pantalla D. la venntana
 asked by Resta
 4,965 views

social studies
2.) Why were Northern States in favor of Hamilton's protective tariff? *The tariff protected North from paying any additional fees when exporting their goods. *The tariff allowed manufactures in the North to charge higher prices for their products. *The
 asked by 123bruh
 11,672 views

Social Studies
I'm supposed to (Quiz question)> "Summarize the reasons why John Adams was not reelected as president in the election of 1800" But I'm not sure what to do so I wanted to ask (My question)> Did the republicans not want John Adams to run again because
 asked by Cate
 2,919 views

Geometry Unit 7 Lesson 3 Answers
Geometry Unit 7 Lesson 3 Answers This has two parst. The first part is the practice, the second part is the quiz. Practice  8 Questions 1. Which theorem explains why the circumcenter is equidistant from the vertices of a triangle? Answer  B. Concurrency
 asked by No Name
 5,575 views

Math
Multiple Choice Choose the best answer. For questions 1–3, rewrite the expression using exponents. 4 × 4 × 4 × 4 × 4 A. 54 B. (My choice) 45 C. 44 ====== 3 × 3 × 3 × 3 A. (My choice) 34 B. 43 C. 35 ===== 10 × 10 × 10 A. 310 B. 101 C. 103 (My
 asked by Pepsi
 4,387 views

PROBABILITY MATH
An unprepared student makes random guesses for the ten truefalse questions on a quiz. Find the probability that there is at least one correct answer. Could some one please help me? And explain to me how they got the answer? and is there another way
 asked by HM
 5,977 views

Mathematics
Multiple Choice Use the following set of data for questions 1–2. 19, 18, 23, 24, 31, 32, 16 Which stems would you use to plot the data? A. 1, 2, 3, 4, 5, 6 B. 1, 2, 3 *** C. 0, 2, 3, 4, 6 D. 0, 1, 2, 4, 6, Hey, I just want to know if I am correct. So
 asked by Madellyn
 2,380 views

Algebra2
I am doing the Factoring Quadratic Expressions Quiz, has anyone done it? I am really stuck on it.
 asked by Jessica
 5,128 views

math
I have no idea where to start! *A quick quiz consists of 3 multiple choice problems, each of which has 4 answers, only one of which is correct. If you make random guesses on all 3 problems, (a) What is the probability that all 3 of your answers are
 asked by Emily
 2,278 views

American Government
Quiz: Diplomacy and the State Department Quiz Diplomatic immunity is based on what assumption? Diplomats will obey the laws of their country of residence. Which of the following reasons would explain why the U.S. shifted foreign aid from Europe to the
 asked by BabyJr
 1,452 views

MATH
Sally is evaluating some test papers. There are 80 multiple choice questions in the test. Students get two points for every correct answer and for every wrong answer or any question left blank, one point is deducted from the total score. Mick got 115
 asked by Please help
 2,001 views

math
Which inequality represents the graph shown below ? 5___________0____________5 I don't understand it This is Solving MultiStep Inequalities Quiz Part 1
 asked by potato
 1,579 views

math
You randomly guess the answers to two questions on a multiplechoice test. Each question has three choices: A, B, and C. a. What is the probability that you guess the correct answers to both questions? b. Suppose you can eliminate one of the choices for
 asked by Kaylan
 1,200 views

Math
Jackie scored 82 and 88 on her first two quizzes. Write and solve a compound inequality to find the possible values for a third quiz score that would give her an average between 80 and 85, inclusive. a. 80=
 asked by Kaai97
 4,881 views

Math 7 A
I need help on math 7 a Lesson 4: Adding and Subtracting Rational Numbers Essential Math 7 A Unit 4: Operations with Fractions Quiz.
 asked by Bob
 4,079 views

Math
A physics exam consists of 9 multiplechoice questions and 6 openended problems in which all work must be shown. If an examinee must answer 5 of the multiplechoice questions and 2 of the openended problems, in how many ways can the questions and
 asked by Anonymous
 13,065 views

Statistics
Suppose that 40 students take a quiz and everyone in the class scores an 80. The standard deviation of scores for this quiz is: 80 2 0
 asked by sam
 3,449 views

Math
A history quiz consists of 60 points and contains questions that ate either true/false or multiplechoice. If a true/false question is worth 3 points and a multiplechoice question is worth 8 points, and the quiz has at least one question of each type,
 asked by Suzan
 2,227 views
Still need help?
You can ask a new question or browse existing questions.